If the statistics actually showed that blacks were being gunned down by police, I guess I'd be more supportive. I wish every department had body cams. The addition of in-car video was so successful it brought a dramatic rise to guilty pleas in DUI cases because, once a defense attorney saw his client as a drunken jackass on camera, he knew there was no way to take that video to a jury trial and win.
http://www.dailywire.com/news/7264/5-statistics-you-need-know-about-cops-killing-aaron-bandler
https://www.manhattan-institute.org/html/danger-black-lives-matter-movement-8866.html