There'll always be cops that sincerely want to serve their community as that's the whole point of the police force, there's just a lack of accountability that also makes the job attractive to assholes who want the power and the respect with none of the responsibility
“The larger the group, the more toxic, the more of your beauty as an individual you have to surrender for the sake of group thought. And when you suspend your individual beauty you also give up a lot of your humanity. You will do things in the name of a group that you would never do on your own. Injuring, hurting, killing, drinking are all part of it, because you've lost your identity, because you now owe your allegiance to this thing that's bigger than you are and that controls you.” - George Carlin