That's exactly how evolution works. Because there is an element of human choice as to which genes go on. We are a part of evolution. We choose what goes on. And we have chosen through war and death that violent men go on, and peaceful men die off. We have chosen that men are disposable, we build our armies with men, we sacrifice the men, and keep the women at home because they are the creators of humanity and men the destroyers and conquerers. Primative but it's reality.

All throughout history, wars are fought almost exclusively by men. Men killing men is alright by nature, because back since tribal times, the testosterone induced violent winner got the women and reproduced. Thus passing on his genes. The violent genes outreproduced the peaceful ones. Look at nature all around us. The violent dominate the peaceful, the aggressive dominate the passive, the intelligent dominate the dumb. The animals at the top of any foodchain are more violent, aggressive, and/or intelligent than the others beneath it.

I have a feeling we're both talking about the same thing just from a different viewpoint.

And it's a shame that postulating genetic group selection is so attractive, since ISTM that this is a very plausible case of group selection of memes about male and female tasks.

That example doesn't really apply if tribes continually split and the more violent tribes continually kill off the less violent tribes.