Police shootings are a problem.  2 family members were cops and i was offered a job after Vietnam but chose otherwise.  It is a rough job, they are trained to protect themselves but like in combat, the daily pressure can get to you and cause mistakes.  Bad people are dangerous.
I am white and don't socialize that much with african americans yet a couple guys I am close to have commented they have been stopped over 50 times and always have to be VERY careful.   They keep  their hands in site on the steering wheel, start and end sentences with sir or officer and still occasionally get a cop with challenging attitude
A cop shouldn't have to risk death, yet the frequency of shootings suggest cops have become to militaristic and forgot they are there for civilian policing.  Hiring is part of the problem when a large percentage of hires were High School bullies and that led them ot want power and control.  We need far more psychological testing pre hire and annually.