Though women are a tiny subset of police officers and they haven't been studied as much, if you did a study you'd probably find that women officers commit domestic violence at a rate higher than women in the general public too.
Part of the investigative reporting work I do is finding and exposing cases of domestic violence in the Seattle police department. The most recent one I found involved a female detective who got her weapons taken from her after a fight in which she put her wife in a headlock.
As is the case with any occupation, certain types of personalities are drawn to policing.
So yes, you'll get mostly men and mostly people with authoritarian tendencies to begin with. I'm not saying that policing just takes perfectly good men and turns them into monsters. Just that transforming yourself into an instrument of coercion strips your humanity away and that has an effect on your personal relationships.
None of the points you are making are incompatible with the arguments I'm making.
