I believe it's the primary reason for the complete apathy law enforcement shows towards de-escalation and self-restraint in general.
Why bother behaving when the standard for prosecuting you is so high as to be laughable?
So a pretty reasonable question you'd ask in the rest of the world is: Why aren't these cops prosecuted for excessive violence? The use of civil rights lawsuits in the US was a workaround for an already broken legal system that doesn't punish wrong doing by certain people.