Evolutionary ethics and moral theory

Conclusion

This example, like the others, demands further discussion. My conclusion must therefore remain modest: an agent-neutral theory of our moral competence is not biologically implausible. Agent-centered rules like tit-for-tat, prerogatives, special obligations, and duties not to harm others might be best regarded as belonging to the theory of moral performance rather than the theory of moral competence. For biologists who may think otherwise, the general argument of this essay is that any claims to the contrary must be based on more empirically well-developed theories of our moral competence and moral performance.

More adequate theories of both kinds are worth developing, even if by themselves they determine nothing about how we ought to live our lives. Biology may help us understand the broad taxonomical categories of moral performance. It may also explain why, at the deepest levels of our moral thinking, we so easily slide into agent-neutral ways of reasoning. But how we ought to live our lives is something that must be determined by social experiment and moral argumentation. Discoveries regarding the empirical nature of morality cannot be made independently of the actual workings of our moral competence, which is itself only one factor in broader social and psychological processes that are capable of leading human beings down any number of more or less morally laudable paths.¹