It is a worldwide problem and of course one should not generalise but more and more police believe that they are now judge and jury.
You realize your children are 8 times more likely to be killed by a cop than a terrorist? Or that in the last 10 yrs police have shot and killed more citizens than US soldiers lost in Afghanistan & Iraq combined? and those numbers don't include the thousands killed by taser, beatings, or other means. Police do have a hard job, they should be paid more, but they also need more transparency and more accountability to the public. The things they are getting away with is murder. Literally.