Moral Psychology and the Unity of Morality

Abstract

Jonathan Haidt's research on moral cognition has revealed that political liberals moralize mostly in terms of Harm and Fairness, whereas conservatives moralize in terms of those plus loyalty to Ingroup, respect for Authority, and Purity (or IAP). Some have concluded that the norms of morality encompass a wide variety of subject matters with no deep unity. To the contrary, I argue that the conservative position is partially debunked by its own lights. IAP norms’ moral relevance depends on their tendency to promote welfare (especially to prevent harm). I argue that all moral agents, including conservatives, are committed to that claim at least implicitly. I then argue that an evolutionary account of moral cognition partially debunks the view that welfare-irrelevant IAP norms have moral force. Haidt's own normative commitments are harmonized by this view: IAP norms are more important than liberals often realize, yet morality is at bottom all about promoting welfare.