I believe it has much more to do with testostorone and chemicals in the brain than any thing else.
Men are stronger and naturally more agressive than women because of their differences in physical makeup.Some men have too much.
Women are usually more gentle and nurturing because of their physical makeup.
We do see acceptions to this and it is very scary to see a woman act out so unnaturaly!
I have learned through experience though that women can be very mean but usually in non violent ways.This is also due to hormones but in this case of the female kind.
Women can have fluctions in their hormones that can have dramatic effects on their temprement.
Also the chemicals and nuro transmitters in the brain of both sexes can become unbalanced causing violent and unbalanced behavior.
I know some of you are more knowledgable than me on this so I'll leave it at this.