The point where I disagree with you is the instant the suspect is unable to defend himself, like the rules of boxing. My personal rule is, "Never follow a man to the ground." If you do, you become likely to be arrested. You seem to be arguing that LEOs can get their blood lust revved up while on the hunt, and when they close in on their prey, beat him bloody, regardless of whether he has recognized he has no chance of escape or defense. Right now, the courts agree with you most of the time, but I do remember one, "high speed chase" that crossed a State Line somewhere around New Hampshire. After the suspect gave up, got out of his pick-up truck, and laid on the ground spread eagled, several cops arrived and beat him bloody while a TV helicopter filmed it. Those cops are now convicted.The problem with public filming is the timing. Rarely do we get the whole story.
I have some doubt about the courts agreeing with you most of the time. If they did, the LEOs wouldn't be caught so often making up fake charges and provocations. "He bladed at me". I think that means he turned sideways to present less of a target. "He squared off at me." I think that means he did not turn to present less of a target. "He was agitated, flailing his arms, disgruntled, angry, resisting without violence...half of that is mind reading, half is contempt of cop, and all of it has been shown on video to be lies at one time or another. If the courts always agreed with you, the cops wouldn't bother to lie on the witness stand (commit perjury).
Cash flow. If you doubt, count how many red light cameras have been removed for lack of profitability.How do they see if it's working? What is their metric?