This is not a reliable method and the cops are not gun slinging psychopaths, despite what the media, and certain political parties, leads the country to believe. I personally find what the media, and other groups do, to borderline on criminal in behavior as it costs lives and creates hate, but that is another story.
There were 800,000 cops, roughly, in the US last year. There were 10.5 million arrests in 2019, this doesn't count normal civilian encounters, only arrests. I imagine there is way over 50 million plus encounters (I can only guess but i think this probably low balling it). The number of total people of all races killed each year by the police hovers at around 1000. It is a small percentage and not all deaths are unjustified. I imagine it a 80/20 split but I apply 80/20 to most things... They are far from perfect but they aren't hunting down the population and mass murdering everyone.