My late Father retired from the police department in 1985. I grew up around police officers. That personality type is rare anywhere in society today. At my dad’s funeral many retired fellow policemen were there. We discussed this topic.
In general how they act at home reflects on how they act on patrol. My uncle is a retired cop. I've never heard any bad on him. I knew a police chief who lived in my neighborhood same thing. Nicest guy you'd ever want to meet.
My late FIL was a cop and at one time a penal farm warden as well. He liked to beat. He beat prisoners, he beat his daughter, it didn't matter to him. His actions likely turned a small time petty crime inmate into a multi killer escapee and caused one of the biggest man hunts in state history.
He was a cop from the 1950's - early 1980's. Started out as a trooper, from there to a warden, went to campus police, then retired a deputy. He should have been culled out in trooper academy back in the 1950's. He had no business with a badge nor for that matter even around kids period.