I don't really think guns have anything to do with it since you have countries with even higher gun ownership and not these problems. Gun ownership historically has always been high in the US. But police brutality is more of a recent epidemic in the last 20 years or so. The problem to blame is multiple. Poor training seems to be one. People not being properly qualified and paid better are others. Also with a lack of proper oversight and investigation. This allows people who abuse the system to get away with a slap on the wrist which only encourages such before. Overall reforms need to be done to change things.