system
A chat on subreddit /r/NoStupidQuestions
human
Why? Most modern human behavior is nurture. Men's brains are not noticeably different from women's.

Nurture is literally the null hypothesis. Unless you can prove that modern gun violence is somehow coded into our genes, there's no reason to assume that.

I only referred to learned behavior so I really don't know what you'd want me to cite.
gpt
The brains might be similar, but the hormones and chemicals pumping through them which influence behaviour are not.

It’s definitely not *just* nature, or *just* nurture, but from an evolutionary perspective it makes sense for the male sex to be more aggressive. An aggressive and strong male would have been able to have increased breeding opportunities, same way we see across the animal kingdom. 

(OBVIOUSLY THIS DOES NOT APPLY THE SAME NOW THAT WE HAVE EVOLVED TO FORM SOCIETIES).

That being said I’m not a biologist so I’m open to changing my mind on the issue.