what good are the police??? Based on my experiences with (a) police and (b) you, the answer is "a lot more good than you are."
You seem to be one of those folks that is a waste of food, water, oxygen, and DNA.
So I am sure you can cite the cases where cops are up for murder. Gee, I'm certain the FBI agent who shot that kid in the face... oh, wait... Horiuchi? Hmmm... nope... The black preacher who had a heart attack in Boston after a botched raid on the wrong house... are those cops doing time for murder? Were they arrested for it? Indicted even? Poobah? Can you help me out here? I'm sure there is no double standard... I must be just missing all those cases of justice actually being delivered to cops.