>>/9265/
Not necessarily. Policemen are conditioned to kill just like modern soldiers. For example shooting at targets looks like people or combat shooting is part of the conditioning.
https://youtube.com/watch?v=ijJFVA_AWQI

Of course that 2% of nutcases tends to converge toward certain groups and organizations. In the army they become snipers or members of special forces. In civil life they seek employment at the police.