it was the LAPD that opened fire on two old ladies in a truck that was the wrong type and color in the middle of the day when they were trying to murder their colleague that put out a manifesto about how corrupt they were. Sure he was killing cops that he thought were corrupt but that's against the fold and a sign that they hold themselves to be unaccountable. dorner was the guy who they eventually burned to death in a cabin in the mountains.
the old saying about the rotten apple is not that there is a rotten apple that is alone in the doings it's that the rotten apple spoils the barrel. you see one bad cop and if you don't have a system that stops that you will have a barrel full of rotten cops.