For every incident of wrongdoing that is publicly exposed and covered in the media, probably 10,000 instances aren't, because no witnesses were in proximity with their video camera on.  Think about that. 

For now, it's an anomaly when there are witnesses who get out cameras and capture the whole incident.  Or when someone knows they are about to get taken down, brutalized, or profiled and harassed, so they can get out the camera in time before a cop starts abusing or attacking them.

When officials respond to that one incident in the media, they only do that to satiate the masses and prevent the riots that would certainly occur in any other country.  There's no real accountability.

Trump has resinstated the program arming small-town police with military gear, so yes, we are a police state.