This officer was out of control and he should face termination. Along with his lieutenant who ordered the arrest. You see as second officer tell the detective to stop mid arrest and the DA obviously saw it for what it was. This isn't a case of a cop being an authoritarian. It's a case of a person being asleep at the conscious level. The guy wanted something and could not get it. And instead of thinking about the situation he simply followed orders. Same thing happened in 1940s Germany.