But if minorities are stopped at disproportionate rates and charged with more serious crimes when arrested than their white counterparts, that would necessarily skew those statistics.
The Guardian, of all places, has an excellent ongoing feature about police killings in the US:
https://www.theguardian.com/us-news/series/counted-us-police-killings
And while race is undoubtedly a factor, income is as well. If there is a downside to BLM and the conversations it has provoked, I believe that's where it lies - in framing the problem solely along racial lines and thus obscuring the fact that in many places, poor whites and Hispanics are butting up against many (but certainly not all) of the same problems. That does strip the movement of logical allies, white people who have experienced some of the same abusive policing tactics (being deemed "suspicious" for having a crappy car, getting ticketed to justify stops, dealing with license suspensions and warrants for inability to pay) but who are not sympathetic to what they view as "the race card".
Sometimes it is for reasons that are well understood. Out here in the sticks, it used to be pretty common for our PD's new hires to be experienced officers retired from the Detroit system. Our town and several others in the area changed the practice of hiring DPD retirees, though, after seeing a pattern of increased complaints about and confrontational encounters with officers with that background as compared to locally-based officers. Whether that's a failing of training or the cynicism of working for many years in the inner city, I don't know. But I do know that it was a Detroit retiree that was responsible for the only negative encounter I've ever had with the police in my community and I was not at all disappointed to see him go. An officer that would lie outright to crime victims as well as to a suspect has no place in law enforcement, IMO.
I think we view MLK's movement through rose-colored glasses, removed by time as we all are. It wasn't entirely a peaceful movement. He wanted a peaceful movement, but he didn't have control of every group that shared his goals and there was plenty of unrest in his time. And there were plenty of whites who viewed him as disruptive and extremist at the time. He only became the universally respected, unifying figure we think of him as today in death, when he was no longer upsetting the status quo and demanding change. Now his memory has become sort of a weapon of shame in many cases, wielded by white Americans against blacks who aren't expressing their outrage and fear and desire for change in ways we find acceptable.