I reject the divine command theory, but a genuine morality can be explained evolutionary. It's not enough for me to pretend that i'm a good person and want to be predictable,. I actually have to feel it. So if i was machiavalian, psypsychopathic and narcisistic, my fellow group mates would catch on to that. And then you feel good about helping me, and we have a kind of reciprocity. This is the evolutionary explanation with the basis of friendships and relationships in society. But i think you have completely wrong conception of morality... morality is not about how you treat other people. If you're bot morality, morality exists on a desert island.