I suspect most police in most neighborhoods are bored most of
  the time. I mean their very JOB is "looking for trouble".

  Its ok when it's a cop who wants to make the world a better
  place, who had dreams of being a super-hero and get the bad guy
  when they were young.

  But it's not good when it's someone who wants to Be Boss and was
  a bully in school. THEY make the bad cops.

  Or... somebody who WAS bullied in school and decided... it's
  payback time and gets a badge. Ex-victims are the worst bullies
  of all.