As stated before, the Floyd case was a fluke because they had him pinned down without movement, but he still wasn't cooperating. Chauvin had done that knee move on others without killing them. Something snapped or he didn't take Floyd seriously, but extrapolating that to racism motivating most cops is fiction. If it comes out that Chauvin or other cops killed whites with that tactic, it will be buried in the news.

The Atlanta Wendy's case was also about resisting arrest. Here's a long video of the incident, with Brooks lying about how he ended up there: https://youtu.be/DhdpG2XzRXQ  The violence happens in a flash after the cop tries to cuff him, with the actual shooting shown here: https://youtu.be/YMn5Gsjijvk  He's shot when he starts to turn as if to use the taser, who surely thought he might also grab his gun after tasing him. They probably fired that cop  to prevent more looting and burning.

https://falseprogress.home.blog/2019/10/27/give-the-police-a-break-martyred-criminals-are-the-real-villains/