Is moral truth a priori and not a natural property of the universe? So says Dr. Russ Shafer-Landau (as articulated in Whatever Happened to Good and Evil in 2003; and Moral Realism: A Defence in 2005). Even though I’m sympathetic to his project, he’s just wrong. And not merely wrong, but too obviously wrong for this to still be a thing in 21st century philosophy. Here I’ll explain why I think that. And in the process you’ll get a feel for how to actually think about moral realism, and how to better understand what morality actually is and how a morality is determined to be true.

This connects with a recent and very relevant interview of me on this same issue by J.J. Chipchase at Naturalistic Philosophy, titled On Moral Theory and Truth with Richard Carrier – Part I. There I outline many aspects of my take on metaethics that inform the following.

Ethical Non-Naturalism: The Phlogiston of Philosophy

I shall be quoting the analysis of Andrew Fisher, in Metaethics: An Introduction (2011), first from pp. 73-74 therein, because he does an already good job of articulating Shafer-Landau’s arguments in terms anyone can understand.

Fisher explains that on one form of moral realism “the features that make moral claims true are not natural features but rather they are non-natural,” e.g. “the non-naturalists would claim that if ‘killing is wrong’ is true then this is because killing has the non-natural moral property of wrongness.” “But,” Fisher then asks, “why on earth would anyone in this post-Enlightenment, scientific day and age think that (a) there are moral properties and (b) these are non-natural?”

One reason why, of course, is to promote Divine Command Theory. Which I wrote about recently (in The Moral Bankruptcy of Divine Command Theory). But there is another, nontheistic approach argued by Russ Shafer-Landau. He writes (as quoted in Fisher, p. 75):

As I see it, there are genuine features of our world that remain forever outside the purview of the natural sciences. Moral facts are such features. They introduce an element of normativity that cannot be captured in the records of the natural sciences. They tell us what we ought to do; how we should behave; what is worth pursuing; what reasons we have; what is justifiable and what not. There is no science that can inform us of such things.

A similar sentiment is echoed by David Copp (ibid.):

There remains a stubborn feeling that facts about what is right or wrong, what is good or bad, and what we have reason to do, have something distinctive in common, and that this common feature [normativity] is something that a natural fact could not have.

Of course we know this is false. The sciences discover and prove normative propositions all the time: best practices in surgery, engineering, agriculture, and every other field, are all normative propositions about what we ought to do to achieve certain goals. They are empirically discovered and proved as securely as any other facts of the world.

Even the desires that define the goals are scientifically, empirically discoverable. The field of psychology, for example, often demonstrates what desires exist in people, which people, and when. That surgeons want to save their patients’ lives is not some mystical Platonic other dimensional faerie magick. It is an objective, physical, empirical fact about the structure of their brain and the effects of that structure on the surgeon’s actions and personal phenomenology. And the existence of the desire entails the existence of the goal which entails all normative propositions about how best to obtain that goal in the circumstances the surgeon finds themself in (once we add in all scientific and other knowledge about the world).

I discussed this before in respect to the debate between Michael Shermer and Massimo Pigliucci and in my writings referenced there (in Shermer vs. Pigliucci on Moral Science). Most people think of Shermer or Sam Harris on this issue, but neither of them is a very good philosopher, and neither has produced a proper case for the conclusion that moral facts are scientific facts. So they are easy targets for any fan of a straw man.

One should note that even the scientific method itself is an empirically demonstrated normative proposition: from observing the comparative results of following it or not following it, we now know it is an empirical fact of the natural universe that one ought to follow the scientific method as well as one can if one wants to know true facts about the universe (and about us, as occupants of that universe). Science itself is therefore a scientifically proven normative proposition, and that is a natural fact, a fact of the natural universe. Nothing else need be the case but the physical facts of the universe, for that normative proposition to be true. And the only way to make that normative proposition false, would be to change some relevant facts about the physics of the universe. (Indeed, ultimately, all epistemology, and thus all facts, are built on normative propositions: for the die-hards who want to explore that, see Epistemological Endgame.)

So already, right out of the gate, Shafer-Landau and Copp are dead wrong. They’ve gone straight off the rails of sound reasoning. They seem not to know that normative propositions are a thing in medicine and engineering. Or that they are empirical propositions, routinely discovered by the scientific method. And they don’t see the obvious fact that moral norms might be the same kinds of things.

What Do You Think a Social Science Is?

Fisher continues:

[According to Shafer-Landau], ‘Naturalism … claims that all real properties are those that would figure ineliminably in perfected versions of the natural and social science’ (2003: 59). The idea is that if, for example, perfected physics requires there to be quarks, then quarks are natural properties; if perfected chemistry requires there to be sodium, then sodium is a natural property; and so on. If this is right, then we have a way of determining which properties are natural, and consequently which properties are non-natural: namely, asking which properties would figure ‘ineliminably in a perfected version of natural and social sciences’.

Note his apt inclusion of social sciences. Quarks and sodium are natural properties of physical sciences. So what are the natural properties of social sciences? The facts of social systems. Which are physical systems. Because sociology reduces to psychology which reduces to neurology which reduces to chemistry which reduces to physics (on the nature and consequences of different kinds of reductivism, see my discussion in Sense and Goodness without God, III.5.5). Just as sodium reduces to quarks (and leptons and bosons etc.).

But social systems are more complex than “just quarks in motion.” Just as sodium is more complex than “just quarks in motion,” which is why sodium is different from uranium, for example, even though both are just “quarks in motion” (on this “only just x” fallacy, which I call the modo hoc fallacy, see the previously mentioned section of Sense and Goodness without God). Unlike isolated brains, brains interacting in social systems behave in ways that reflect the structure and behavior of the social system. So if sodium is a natural property of chemistry, then (minimally) brains are a natural property of psychology, and then systems of interactions among brains are a natural property of sociology.

Moral facts are facts about social systems. They are therefore every bit as much natural properties as sodium or quarks are in Shafer-Landau’s sense. So not only did Shafer-Landau’s train of reasoning slide off the rails, it has also fallen off a cliff into the sea.

Thus, as Fisher describes it (the remaining quotes are from pp. 81-87):

[For] Shafer-Landau ethics is not a natural or social science. He argues this because he thinks that what demarcates natural and social science from other disciplines is that they discover their principles and truths a posteriori. What makes something a science is that it precedes through experimentation, observation and empirical testing. So if ethics is a science then these features should be central to ethics – but, according to Shafer-Landau, they are not. Rather, in ethics we come to discover moral truths a priori.

Not at all true. We discover normative propositions, in all the practical sciences (like medicine and engineering) as well as in moral reasoning, by discovering what people desire (in the latter case, what they want out of life, the kind of person they want themselves to be, how they want the social system they must interact with to treat them, and so on) and by discovering what behaviors best obtain those desires (and by extension what habituated virtues will most reliably cause those behaviors).

All of this is discovered a posteriori, not a priori. We do not know, and cannot know, what people want most dearly, by any a priori method. Nor can we know a priori what they would want when given more information (about themselves and the world). And we do not know, and cannot know, what virtues and behaviors will best get them what they want, by any a priori method. And yet knowing both those things is alone sufficient to entail an entire system of normative propositions about how people most ought to behave (see my answer to the last question in the Naturalistic Philosophy interview). Moral facts are thus a posteriori facts. They are not a priori. Shafer-Landau’s derailed train has sunk to the sea floor.

So when Shafer-Landau argues, as Fisher puts it, that “some moral questions such as ‘Is it right to keep promises?’ or ‘Is genocide wrong?’ … we don’t discover an answer through empirical tests,” he is simply full wrong. We do indeed discover the answer through empirical tests. We discover the motives, the reasons people care about and obey moral propositions, though empirical observations (“tests,” whether formal or informal). And we discover the consequences that demarcate moral from immoral outcomes through empirical observations (again “tests,” whether formal or informal). Thus, the answer to “Is it right to keep promises?” depends entirely on what the consequences are of doing so—which is an empirical question—and what consequences people really most want to produce in the world from their decisions, when fully and correctly informed of what all those consequences are and what all they really want out of life—which is, again, all an empirical question.

This can’t be avoided by insisting morality must be deontological, either. Because deontological ethics are either self-evidently false or reduce to consequentialism. I discussed this in detail already in Open Letter to Academic Philosophy: All Your Moral Theories Are the Same.

The Parallel to Philosophy of Mind

Fisher continues:

Shafer-Landau writes: ‘The sort of non-naturalism that I find appealing is one that bears a very close structural parallel to certain non-reductionist theories in the philosophy of mind” (2003: 72). What are these parallels? Shafer-Landau points to three (ibid.: 71– 4). The first is the multiple realizability of mental states; the second is property dualism; and the third is the anti-reductionist’s accommodation of supervenience.

Do you know what is also multiply realizable? Video games. Automobiles. Desks. Pretty much everything that exists. Do you know what we normally call multiple realizability? Abstraction. The word “desk” refers to a pattern of organization that can be realized infinitely many ways, in wood, plastic, stone, the bones of blood-sacrificed goatherders. Does that make “being a desk” a nonnatural property? No.

Honestly, how can any philosopher stay employed today and still be claiming that abstracted properties (properties, like physical shape, that can be shared by many objects) are not natural properties? And as with any of those things, so are mental states. Just as many materials can form a desk, just as many arrangements of circuitry and software can realize the same video game, so can many different material systems produce the same mental phenomena. I should not have to explain this. This is modern science 101.

Since “multiple realizability” does not make anything “non-natural,” it can’t do so for moral facts either. Sociology has discovered a number of partial laws governing social system interaction. Organize a society a certain way, and you can predict certain things will result. The entire field of economics is based on this.

Economics, by the way, is multiply realizable. American dollars look nothing like Canadian dollars and aren’t made of the same stuff. Yet they are all natural objects and they obey the same laws of economics. Indeed, American paper dollars and American gold coin dollars look nothing alike and are not made of the same stuff. Yet they are nearly identical in how they function within the economy. A dollar is a dollar. And “being a dollar” does not make coins and bills “nonnatural,” nor does it make the “dollar” as an abstraction nonnatural. The fiduciary value of “the dollar” is without remainder the causal effect of a particularly arranged social system of interacting brains composed solely and without remainder of quarks and leptons and bosons. There is nothing left we have to “add” to make dollars have the value they do. All we need are the quarks and leptons and bosons (and the spacetime manifold they inhabit), arranged in that particular way.

As for dollars and economics, so for moral facts. (See my articles on Moral Ontology and Goal Theory.)

Science has of course found no evidence of substance dualism, despite centuries of trying. It’s as dead a theory as, again, phlogiston. And as all properties are the logically entailed effects of substances arranged in particular structures, there isn’t any relevant property dualism either. It’s natural physics all the way down.

That said, theory of mind is the only place left for property dualism to hide. Because neuroscience has yet to develop the instrumentation necessary to explore what causes qualia or why.

Though even if we choose to demarcate a property dualism in the mind, neither of the properties involved are likely to be nonnatural. We do not yet know, it is true, exactly how the brain generates the qualia it does. But we do know it is the physical meat of the brain that does it. Remove the meat, the qualia go away. Split brain patients provide a good example of this. As do patients who suffer brain damage or have areas of their brain temporarily numbed. Electrically stimulate a designated area of the meat, and the expected qualia are produced. Mix up the meat’s wiring, and you mix up the qualia (survey the documented varieties of synesthesia, including synesthesia induced by physical interference in normal brain chemistry…you know, drop some acid). And so on.

So there is no evidence yet supporting the conclusion that qualia are metaphysically distinct from the physical information processing of the organ of the brain. I’ll grant you could speculate such a thing (and this all comes down to whether philosophical zombies are logically possible). But speculation in, speculation out.

And that’s only for the mind.

Qualia are a special case because they lie at the frontier of the science of the mind. Though also scientifically unexplored, and in many points perhaps beyond present means to scientifically explore (so they have that in common at least), there is no other parallel here with moral facts. Moral facts are like the facts of sociology, economics, political science, military science…there is no case to be made that metaphysically alien properties have anything to do with these, any more than there is any basis for believing gremlins and fairies are involved in them either. They are solely and without remainder produced by the physical systems that realize them. We know this, because you can’t have the properties without the systems, and you can’t have the systems without the properties (for more on that, see The God Impossible)—and most importantly, we can explain why that is: we can show why an economic law operates, without positing anything more than physical systems with the requisite physical properties. That’s why a natural-nonnatural property dualism is as dead a theory in this domain as the theory of faeries is in explaining the foibles of household laundry.

Meanwhile, “supervenience” as a concept does not entail the existence of nonnatural properties. Once you eliminate substance dualism, and properties as the inalienable realization of physical systems, and abstractions as repeated patterns of physical arrangement, there is nothing left. The logical possibility space is fully exhausted. There is no room left for any “fourth thing” for supervenience to refer to.

But be that as it may (maybe someone can convince me there is some intelligible thing yet left that the word could be referring to), supervenience does not make moral facts nonnatural anyway, any more than it does for economic or political facts, or the fact of something being a desk.

So moral facts are not like qualia. Not in any relevant way. This is a fallacy of false analogy. But more importantly, if qualia are “real properties that figure ineliminably in perfected versions of brain science,” and indeed they undeniably are even on Shafer-Landau’s most dualist imaginings, then qualia are natural objects. By Shafer-Landau’s own definition of what’s natural! So how can he get to nonnatural properties with this analogy, even if the analogy were valid? Oh right. He can’t. (Should a mistake like that pass peer review?)

Let’s Try a Better Analogy: Mammals

Of course, the actually correct analogy I’ve already referenced: the facts of sociology, politics, economics, etc. But let’s assume we didn’t notice that. Let’s try Shafer-Landau’s thinking on mammals. Because that will show how silly it is.

Fisher describes Shafer-Landau’s concerns about multiple realizability like this:

Shafer-Landau thinks that this point about multiple realizability is true for moral properties. Let us consider the moral property of wrong-ness. We judge many actions wrong even though they have many different and distinct properties. For example, an action might cause pain or pleasure; it might be illegal or legal; public or private. Yet despite this variety we still think that all these actions can have the property of wrongness.

Let’s rewrite that paragraph:

Shafer-Landau thinks that this point about multiple realizability is true for animals. Let us consider the moral property of being a mammal. We judge many animals to be mammals even though they have many different and distinct properties. For example, a mammal might be tiny or giant; it might be aquatic or arboreal; it might be an herbivore or a carnivore. Yet despite this variety we still think that all these animals can have the property of being a mammal.

I won’t insult you by explaining further. Reductio ad absurdum. We’re done with this argument.

Let’s Try a Better Analogy: Surgery

The desire for the surgeon to save his patient is a natural property of the surgeon. All the facts of how best to achieve that are natural properties of the surgeon, the patient, and the rest of the universe.

Consider one key step: suturing, i.e. closing the wound caused by their surgery, which is necessary in most cases for the safest and most successful healing and thus the greatest chance of survival for the patient.

There are many different ways to suture a patient after surgery. Not only that, but many are equally effective, so that it does not matter which the surgeon uses. Some may be less effective, but can’t be realized in the circumstances, e.g. a battlefield surgeon working with improvised materials will have their options limited. But let’s consider the case of different but equally effective suturing techniques.

This is multiple realizability. “A surgeon ought to suture her patient after surgery, if the surgeon wants to save her patient’s life” is true not because of any nonnatural properties of sutures. There are only natural properties. That one technique is as effective as another is a physical fact of human flesh, suturing needles, and suture materials. One does not have to appeal to nonnatural properties to explain why they are both equally effective. Physics fully explains it already. We can identify physical facts in common between both suture techniques that realize equally the same outcome (saving the patient’s life).

Moral judgments operate exactly the same way as surgical judgments. The only difference in fact is that surgical judgments pertain to the goal of surgery, while moral judgments pertain to the goal of morality.

Which means, once you identify the goal of morality, you are half way to discovering true moral facts. Just as once you identify the goal of surgery, you are half way to discovering true surgical facts.

And since moral facts are by definition (by which I mean, the only definition of any use that corresponds to how nearly everyone uses these words in practice) “that which a person ought to do above all else,” you need to identify that which a person really would want above all else (if they were adequately informed of what’s relevantly true). Because only what they want above all else can produce a true conclusion about what they ought to do above all else. Because a greatest desire entails a greatest goal which by being greatest supersedes all other goals. Therefore the resulting imperatives supersede all other imperatives.

That’s morality.

Everything else is false.

Conclusion

Schafer-Landau failed to notice:

  • Moral facts have no relevant similarity to qualia. Just as all other social facts don’t, from economics to political or military science.
  • Qualia are natural facts anyway, by Shafer-Landau’s own definition of natural facts.
  • The sciences discover and establish the truth of normative propositions all the time. We see this in medicine, engineering, agriculture, etc.
  • Moral facts are facts about social systems (even more particularly, about agents in social systems). They are therefore every bit as much natural properties as sodium or quarks are in Shafer-Landau’s own sense.
  • Moral facts are only ever discovered a posteriori, never a priori.
  • And we know this because (a) all moral systems are actually in fact consequentialist, and what consequences a behavior has can only be known a posteriori—quite simply, the morality of a behavior cannot be assessed in ignorance of a behavior’s effects; and (b) no moral system can be true that an agent has no sufficient reason to obey, and what reasons an agent has to obey can only be known a posteriori.

And none of his peer reviewers noticed any of these things either. Nor any other philosophers he bounced any of this off of. That’s a problem.

Meanwhile, most philosophers don’t realize:

  • True imperatives in all domains only ever consist of what best achieves the most overriding goal of the agent. No one has discovered any other way of making an imperative proposition “true.” Not in thousands of years of trying.
  • All other imperatives are literally false. Because an agent, for whom an imperative is supposed to be true, will always desire some other outcome more. So it will always literally be true that they ought to do something else.
  • Therefore, if there are true moral facts, they can only be facts about what best realizes what the moral agent would most want when relevantly informed.

Schafer-Landau shares these failures of the broader philosophical community. The previous list of failures are mostly peculiar to him (though not solely; others commit these same errors).

Philosophy needs to make some serious progress here. We know what imperatives actually are. We know they are a posteriori. We know science can empirically discover them. We know what natural facts make one imperative supersede another. We know moral imperatives are imperatives that supersede all other imperatives. We know moral facts are facts about social systems and the agents within them. We know social systems and the agents within them are natural facts and wholly constituted by natural facts. And we therefore know moral facts are wholly constituted by those natural facts, and are therefore natural facts themselves.

Let’s just accept this already, and get to work on describing the scientific research necessary to discover what they are.

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