The Evolution of Moral Axioms

I was always trying, even maybe 30 years ago, to find ways in which you could tighten up the arguments that you could bring in some role for reason in this. The problem with the position that my mentor, RM Hare, had developed was that he said that universalizability just depended on the concept of the basic moral concept, ought, good, and right. That seemed too easy a way out of moral arguments. So I was looking for something a bit stronger and looking at whether you could argue that there was a rational requirement that was corresponding to this universalizability.