Honestly, it's remarkable how often they hold (or held, now that it's unpopular) people down in just that way. There's a few other not-nice ways to disable someone.
Usually they don't die. Designing a protocol is not such an easy thing.
Talk to someone who has worked in a cell-extraction team, it's a pretty outrageous scene.
'inherent racism'? Sounds like someone who has a purely internet knowledge of policing. The world's a complicated place. Save your outrage to bore your friends.