[thecoppinger]

I wrote my original comment at the midnight hour as I was falling asleep; I should have clarified that I meant more ancient than that, i.e. pre-agriculture, post-cave dwelling.

More along the lines of:

Jim has a bad habit of being a bit of a dick—harassing & bullying tribespeople, taking an unfair amount from the tribe—Jim gets removed from the gene pool next hunting trip. The quality of the tribe, present and future, improves.

I understand how this kind of thing doesn't track very well as a strategy overall in more complex & modern environments.