You and similar keep shrieking for justification. There isn't any. I have said repeatedly that he reacted wrong, and proposed solutions to prevent it, and opposed the retributive punishment. It's magical religious thinking that drives this demand of blood for the blood god. It serves no purpose. It achieves no goal rather than slaking perverse and pointless lust for revenge. Retrain the cop. Evaluate the cop. Investigate his history. Quit screaming to crucify him.
Obviously, you have not bothered to read my responses. Early on, I repeatedly wrote that an investigation may find mitigating circumstances. But, if there are none, this police officer not only broke the law but he broke the trust given to him. If he broke the law, he should be treated like anyone else in that situation. So, unless you arguing that no one who assaults someone else should be arrested and tried, your repeated mewlings about lusts for revenge are examples of sociopathic strawmen.