Whatever it is, it’s not systemic. Given the millions of police interactions in a year, a few bad incidents is to be expected. No one is 100% all the time.
Except you have no evidence for your claim. It's obviously widespread enough that police feel comfortable doing it in front of other police.
Wut? You're saying there's a police policy to purposefully harm people? In the Floyd case, the cops actually followed their training exactly. If you think it's systemic, show your evidence (not just hand waiving and conspiracy theories).
Yes and no--you're no doubt referring to that previously being an acceptable restraint.
What you are missing is they had no reason to do that at all, there was no reason to take him out of the car and hurt him. That was purely punitive.