Four decades ago, E.O. Wilson famously declared that “the time has come for ethics to be removed temporarily from the hands of the philosophers and biologicized." One still finds Wilson’s idea echoed frequently in popular science writing today. While I’m not going to deny that evolutionary biology and other sciences have important things to tell us about morality, I think there is a lot of confusion about what exactly they can tell us, and how much they can tell us. My (...) aim here is first to make some distinctions and sort out some issues, and then to examine one overreaching claim in particular, about the explanation of our moral beliefs by appeal to evolutionary causal influences. That is a claim used by some philosophers to argue that evolutionary biology somehow forces on us either a skeptical or a purely subjectivist understanding of morality. I will explain why I think this is misguided and is a poor use of science in philosophy. (shrink)

What implications, if any, does evolutionary biology have for metaethics? Many believe that our evolutionary background supports a deflationary metaethics, providing a basis at least for debunking ethical realism. Some arguments for this conclusion appeal to claims about the etiology of the mental capacities we employ in ethical judgment, while others appeal to the etiology of the content of our moral beliefs. In both cases the debunkers’ claim is that the causal roles played by evolutionary factors raise deep epistemic problems (...) for realism: if ethical truths are objective or independent of our evaluative attitudes, as realists maintain, then we lose our justification for our ethical beliefs once we become aware of the evolutionary shaping of our ethical capacities or beliefs, which would not have disposed us reliably to track independent ethical truths; realism, they claim, thus saddles us with ethical skepticism. I distinguish and spell out various evolutionary debunking arguments along these lines and argue that they all fail: the capacity etiology argument fails to raise any special or serious problem for realism, and the content etiology arguments all rely on strong explanatory claims about our moral beliefs that are simply not supported by the science unless it is supplemented by philosophical claims that just beg the question against realism from the start. While the various debunking arguments do bring out some interesting commitments of ethical realism, and even raise some good challenges as realists develop positive moral epistemologies, they fall far short of their debunking ambitions. (shrink)

Andreas Mogensen has recently argued that the current debate over evolutionary debunking in ethics is mired in confusion due to a simple fallacy committed by debunkers and uncritically taken on board by their opponents. I argue that no party to this debate is involved in the type of confusion and fallacy Mogensen has in mind, which he himself notes would be an absurd and outlandish mistake for anyone to make in other domains. Debunkers do plausibly commit an error in their (...) explanatory claims about our moral beliefs, and it is related to an issue Mogensen discusses, but it is not the confusion and fallacy he identifies. (shrink)