as a policeman they teach you how not to be a criminal. youre expected to not be a criminal. i dont think "do as i say not as i do" works for any legal occupation. but i guess those that know the rules exploit them the most.
I agree policemen should not be criminals, but I also think the media "blows up" when the police officer gone bad story comes up, no different then the coverage stories about other occupations where "bad people" are not expected - like clergy, school employees, doctors, etc. Fortunately or unfortunately, police are not robots (didnt work in 1980s movie), they are humans, and we know some people can be swayed in the wrong direction for a multitude of reasons.