It's been a pattern in our culture for a long time to attribute behaviors and motivations to people's private parts. And while there are differences in our hormones as a result of our sex chromosomes, those differences are not things that determine our ways of relating to each other.
Overgenitalization is a term I am coining to help us deal with this problem. Violence doesn't come from a person's under-bits, it comes from the environments and social experiences they are raised in.
Nurture doesn't come from someone's reproductive body parts...it comes as a result of being nurtured or encouraged to nurture.