Just Google homicides by police in the US [1][2]. The US has a very high percentage of civilians, not all criminals, shot dead by our very own police force compared to all other nations, and not just developed countries.

  [1]  http://www.dailynews.com/2015/05/04/american-police-kill-civilians-at-a-shocking-rate-compared-to-other-developed-countries/
  [2]  http://time.com/4404987/police-violence/