It's not assumed, but it IS a possibility that there would be more people that WOULD feel comfortable asserting their 'power' in some professions than in a group of Accountants for example.
You do a great job, that MOST of us couldn't ever do. You get to see the worst of things, the worst moments in people's lives. You get to arrive at the accidents BEFORE the Ambulances, you get to do the knocks on the doors.
I get why you get riled. I really do. I get riled when I see DV victims portrayed as stupid chavvy women that have no hope of helping themselves, no brains and are not worth helping. Stereotyping is crap and harms everyone.
What has to be done is that all sections of society need to understand that there are dysfunctional and aggressive people in all walks of life and no matter their level, violence/abuse against others won't be tolerated. We've come a long way in our lifetimes, but still have far to go.