There are many of god-fearing, patriotic cops; however; a lot of cops are just criminals with a badge. The vast majority of crimes on military installations are committed by military police—check out the blotter on any post. The difference is the military actually prosecutes them, while police in the civilian sector literally get away with murder.
History is replete with the same stories. Police are needed because men are evil; but we want to believe they are somehow able to rise above it by virtue of just being a cop. Unfortunately, cops are only as good or bad as the society they inhabit, and that doesn’t bode well for us. To put it in the Aristotlean fashion:
All men are evil.
All police are men.
All Police are evil.
The only thing that saves society is that neither men, nor police are exclusively evil.
Heavily armed police are the “standing army” the Founders warned us about. Liberty dies when the rulers no longer fear the people.