Antagonizing a local police officer is a terrible idea unless you are wealthy and/or well-connected. Most are kind, but not all are, and antagonizing the wrong one can make your life hell.
(I also agree that the vast majority of police are not "murder junkies". But it's also not surprising that a handful of folks like that do join an organization that nearly always manages to protect their members from repercussions when they use lethal force.)