Er what evidence do you have of that? And do you know why? As an analogy a disproportionate number of black males are imprisoned in America, do you know why?In the real world, those with physically female bodies simply follow a different and inarguably superior system of ethics. Ethics simply cannot apply equally to the sexes if it is the fact - and it is - that any serious transgressor of ethics is VASTLY more likely to be male almost to the point that he can be assumed to be male.
Why do you suppose there is a female and a male sex?
Also violence is a very useful and highly desirable trait depending on the situation.