Are there people who misuse power? Yes. Unfortunately, it is in human nature to seek power. Oh, you don't seek power? Good for you, you overcame human nature. Guess what? Other cops are in that same situation, and they don't seek to abide power. They seek to use what means they can to serve and protect others. And there are some times where the poor guy just had a bad day. Everybody has them. Maybe he saw something disturbing on the last job, and he's carried that with him. I'm not saying this trying to excuse the fact that there are times when police can turn violent. I'm saying it to remind you that they're humans too. They have feelings, mistakes and bad days just like you. When you work for the government, you have nearly every single phone camera near you watching. Observing. Judging. For years before a certain day, they may have behaved properly. All of those days have been recorded by passerbys, but those videos aren't dramatic, so they don't even get any form of media cover even if it gets uploaded. But one day, something bad happens. He does something stupid and violent. Those silent cameras now turn on him, and since it's dramatic, everybody wants to see. That doesn't happen to everybody else though. There's nobody watching you 24/7, nobody to catch your mess ups on video.