AACAB I can get behind lol. ACAB half the time is just straight up internet trolls and instigators. Meanwhile the same people love to espouse shit like how the wealthy are the real oppressors while ignoring most police are only firmly low-middle class. There are way more people getting into that job who just happened into it like most people in the world. While yes, the abusers and psychopaths are attracted to the job for the above, the separation of powers in places like that are wide. Just like they would be in most businesses. Let alone the real deal PTSD they have to deal with daily to weekly in som areas.

Any direct supervisors for teams that have pretty full automony know it's impossible to track what they do constantly. So much of it is based on the trust system and good faith actors speaking out when they see something. Throw in some bystanders effect and benefit of the doubt for people who'd normally be good to you but a monster in the shadows... I'm not envious of police one bit, or the people trying to make change from the inside. Which is the only real way it's going to happen despite internet tough guys espousing otherwise while refusing to pay taxes for shit like mental health services lol. Elected local/state politicians, DAs, also being the people who could make those changes. Also equally vilified.

It's way more complicated than people give it credit for when you're actually trying to make change. For most people trying to get by, best thing you can do is vote.