The apparent gap between (presumably irrational) moral convictions and their corresponding (rationalized) justifications does not constitute evidence for Pinker's repeatedly un-argued assertion that we indeed have a "moral sense", that is, a set of built in moral categories which are the product our own psychological evolution. Pinker and colleagues, by the way, are certainly not the first thinkers to suggest that human beings make moral determinations based on the operation of something they call a moral sense. As a putative explanation of morality, moral sense theory dates back at least to the mid 18th century.
The upshot of Pinker's essay, however, is that after going to extreme lengths to suggest precisely this-that our experience of morality is ultimately anchored in this "figment of the brain" he calls the moral sense-he will end by denying this very premise or at least severely qualifying it. I'll get to that in a minute.
Not withstanding my critique, there is actually plenty of interesting material in Pinker's essay, just as there are plenty of good and valuable insights to expect from the field of moral psychology-much or all of which will be perfectly compatible with (or at least accountable for) from within Aristotelian-Thomistic natural law theory.
For instance, Pinker spends much of the essay speculating on the significance of a set of instinctive moral intuitions which researchers suggest are shared in diverse ethnic and cultural traditions the world over. Pinker observes that such observations appear to lend credence to the theory that humans are hardwired with a "universal moral grammar". Explaining an analogy from the political philosopher John Rawls, Pinker notes that just as the linguist Noam Chomsky suggested that infants are outfitted with a "universal grammar" enabling them by default to analyze speech by way of built in categories of grammatical structure, so too, an innate universal moral grammar "forces us to analyze human action in terms of its moral structure, with just as little awareness."
Pinker goes on to explain how those moral structures could consist in such things as the following: the impulse to avoid harming others; the propensity toward altruism and fairness; our inclination to respect authority; our avoidance of physical filth and defilement as well as our avoidance of potentially risky sexual behavior; our willingness to share and sacrifice without expectation of payback.
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Some moral psychologists have reduced these to a specific set of categories-namely 'harm', 'fairness', 'community', 'authority' and 'purity'-which they understand to work as fundamental building blocks of our moral experience. These five categories, explains Pinker, "are good candidates for a periodic table of the moral sense not only because they are ubiquitous, but also because they appear to have deep evolutionary roots." He adds, for good measure-and again without argumentation-that these five moral categories are "a legacy of evolution."
Now even though, reading between the lines, we discover that Pinker must be quite convinced that these categories are the product of evolution ("figments of our brain"), he nonetheless sustains that "far from debunking morality, the science of the moral sense can advance it, by allowing us to see through the illusions that evolution and culture have saddled us with and to focus on goals we can share and defend." By this he appears to suggest we should simply learn how to cope with inborn moral sense, quirks and all (such as our taboos against homosexual attraction, and our "yuck" response to the prospect of things like human cloning), leveraging our understanding of both its virtues and defects, in order to cobble together a kind of shared set of moral values and societal prerogatives we can all live with. Indeed, affirms Pinker, we must get around the quirkiness of that built in moral sense because it can potentially "get in the way of doing the right thing."
Now, that begs a huge question, doesn't it?
If not in terms of our built in moral sense, then in virtue of what exactly is Pinker proposing that we can know "the right thing" to do? His affirmation can only makes sense-contradicting what would appear to be a core assumption of his article, namely, that the moral sense is all we've got-if there is some other moral agency in us with which we can judge, refine, correct, or ignore our built in moral sense.