 A related but somewhat different debunking argument focuses on the origins of moral concepts (Joyce 2006, chap. 6). It begins with the claim that we have a complete non-moral genealogy of our moral beliefs—a complete explanation of how we’ve come to believe what we do, which does not require any appeal to moral truths. Instead, we explain the origins of our moral concepts—such as fairness, justice, and guilt—in evolutionary terms, recalling that natural selection would have rewarded genetic propagation, not the tracking of moral truths, in shaping them; and then we explain our beliefs employing those moral concepts in familiar sociological and psychological terms. The claim is then that the existence of such a non-moral geneaology of moral beliefs makes the notion of moral truths “explanatorily superfluous”—just as truths about witches are explanatorily superfluous given a complete genealogy of beliefs about witches that does not involve any appeal to truths about witches. And if moral truths are explanatorily superfluous, then we should not posit them, any more than we posit truths about witches: we should remain agnostic about moral truth and give up any claims to moral knowledge. In other words, evolutionary biology leads to moral skepticism.