You are treating this as cause and effect, i.e. cops kill people because people shoot at them. This is more of a case of the chicken and the egg, do civilians s

You are treating this as cause and effect, i.e. cops kill people because people shoot at them. This is more of a case of the chicken and the egg, do civilians shoot police because police shoot civilians or do police shoot more civilians because civilians shoot police. Regardless of the answer, US police have a more violent response than other police. Anecdotally you just need to look at those situations where the police fire off 100's of rounds at a suspect, or where there is a chase and 50 cops leap from cars to jump on(and beat) as suspect. Body cameras for officers are the only way for the US to reverse the trend of a hyper violent Law Enforcement officers.