To me, this sounds like a naturalistic fallacy. "It's nature, so it's morally correct."
Morals have nothing to do with it. It's just nature.
We evolved to dominate the world because of our cooperation
Agreed - but that is the negotiations part of interaction. When negotiation falls apart - you're still left with violent action.
The evolutionary biology doesn't take away - or alter from this innate behavior.
Fights on Saturday night, to tribal confrontations, to war.
The same patterns _forever repeat themselves, irrelevant of historical times.