Committing immoral violence is an unavoidable part of EVERY cop's job. There cannot be a "good cop" any more than there can be a "good car-jacker." Every cop's job is inherently evil, because a cop cannot just decide not to go after people who commit "victimless crimes," which make up MOST of the people the police harass, fine, or imprison.
Read the whole story here: http://www.rogershermansociety.org/nosuchthing.htm
By the way, of all the nations of the world, the U.S. now has the largest percentage of its people in prison. So much for the "land of the free."