I meant that we already do have a field of applied mathematics and science that talks about those things, why do we need moral philosophy?

I am not saying that it is a clear cut issue that we, as computationally bounded agents, should abandon moral language, or that we even would want to do that. I am not advocating to reduce the complexity of natural language. But this community seems to be committed to reductionism, minimizing vagueness and the description of human nature in terms of causal chains. I don't think that moral philosophy fits this community.

This community doesn't talk about theology either, it talks about probability and Occam's razor. Why would it talk about moral philosophy when all of it can be described in terms of cultural anthropology, sociology, evolutionary psychology and game theory?