To guest if the cop "even" shot at the head, bloody well will die. You have to be very bloody lucky to survive a bullet to the head. Anyways, with the right pressure or spot to the head can kill anybody. But that is besides the point. I'm referring to the fact that the criminal will possibly have a real gun. The cop has so much protection that can defend s/his life. One shot to the head s/he will die. The cops you see on the street only get vests. When it comes to more serious situations the "street cops" are in the background while personal that are train will handle the situation. I guess I did overestimate the flailing of the legs and arms but what I hope you got out of that is that the cop should try to disarm then kill the criminal.

I understand what you are saying and agree but you are forgetting that the criminal might have a real gun. The rubber bullets are not going to defend s/he cop against the criminals real gun. It's like the phrase "bringing a knife to a gun fight." The best way is to teach the cops not shoot to kill but to disable the criminal so they can bring the criminal into custody. For example shoot them in the leg or arm or lower torso where they will not die instantly and be easy to catch.