Moral Relativism

Oh what the heck, I'll give it a shot. I'm not sure if I believe this fully or not, but here goes:

What if those who believe in moral absolutes argue that morality is essentially some sort of combination of Platonic and Kantian Metaphysics/Epistemology? What I mean is there are moral absolutes that really exist, it's just that we can not fully understand them. All we see are the shadows of those absolutes and we slowly come to learn them over time, but may never see the real absolute morality. We see morality differently at different times because of the evolution of the type of people that we are.

My belief is that a Platonist most definitely would say that the forefathers were immoral. Platonists are moral realists par excellence.

But the Platonist has the huge problem of explaining just what the hell his universals are. I mean it seems real easy to say morality exists as a universal up there in the sky. But exactly what that universal is and how it can have any effect on our world seems hard to unravel unless those things are physical properties that are seemingly the only things that have existence here.