What is the actual evidence that the gender difference in violence/aggression is social and not biological?

If higher levels of male aggression (relative to women) are the result of socialisation, what is the actual evidence?

Higher levels of aggression among males is fairly common among other mammals, and likely has a biological basis. So what is the reason for assuming the case is not the same for humans? (And yes, I know females are the more aggressive sex among some species, but the point still stands- if sex contributes to behavioural differences in those species, why wouldn’t it in ours?)

None of this is to say men have a right to be violent, or that violence is more acceptable when carried out by men. But if male aggression has a mostly biological basis, then I would guess that trying to “socialise them out of it” probably isn’t the most productive strategy. Public officials and elites have had strong incentives to limit violent behaviour for millennia- if they could do that through socialisation alone, I’m guessing the idea would also have some credibility beyond feminist circles.