Hi, I'm wondering what is the purpose of moral philosophy assuming that our moral intuitions are mere products of evolution. Evolutionary psychology seems to explain our moral roots (genes that coded for cooperation helped the organisms in which they resided reproduce and replicate those genes). Given this, our instincts that say we should behave in certain ways are merely adaptations that increased survival. It seems then that there is no objective answer to "What should I do?" and the entire field of normative ethics is premised on the delusion that there is.
Wouldn't it be more honest for professors of moral philosophy to tell their students that they're merely looking for a consistent framework for decision-making that best coheres with our moral intuitions? And that outside of these intuitions (which arose because they increased survival), there is no warrant for believing in some absolute, metaphysical grounding of ethics--in other words an objective answer to the question "what SHOULD I do?" Thanks!