I'm going to say something very unpopular here. Cops everywhere are not at all the same. Yes, they are in some things: public safety, officer safety. rule of law. But I'm not naive to the fact that in *some* places these aren't true.
It's tough for me to not bristle when I read about bad cops, because I hate those too. But there are lots and lots of good cops who get tarred with the same broad brush when they don't deserve it. /end rant
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When a department is infiltrated by sociopaths, they drive out the decent cops. They'll backstab anyone who doesn't play by their rules. A larger department is more likely to attract people who are going into police work because they are attracted to the idea of busting people's heads.