The police are more or less a legal GANG. Look, a profession where a guy with a badge, a uniform, and a gun wields so much power is naturally going to attract power-hungry people. That's why I say 98% of 'em are egomaniacs

. Now at the same time, I know good cats that became cops in the town they grew up in; they're fair cops doing their job... I can dislike cops, but at the same time standards NEED to be enforced, so I don't have a problem with these people performing their job... Yellin FUCK THE 5-0 ain't gonna accomplish shit.
Bottom line is police forces are full of corruption and inner-politics. I have been legitimately fucked with by cops so I'm not just saying this for no good reason.
There are good ones and bad ones, at the end of the day they are people too, but there are certain lines of work that attract those seeking power - this is one of them.