The statistics show race isn’t a big issue (black cops are just as likely to kill blacks as white cops are). The issue is police abuse of people they are arresting, regardless of race (and perhaps not regardless of class – rich people tend to get much better treated when getting arrested). There is no excuse for police to being injuring unarmed persons, even if they deserve it.
When a cop busts someone, for, as an example, passing out “under the influence” in an illegally parked car, they have to treat the guy the same way they would treat their “let’s not talk about him” uncle who sometimes gets drunk in the wrong time and place. When arresting an unarmed suspect, perhaps one freaking out at being arrested, he should treat him the way he would treat his own kid if some childish prank ended up with someone calling 911.