> Must make split second life and death decisions and if you are wrong, you can go to jail for lifetime.

This is not even remotely a good-faith description of the reality. The police brutality cases where there are charges filed are always very obvious deliberate murder by the police. And very few of those go anywhere, only the most blatant receive any kind of sentencing.

I challenge you to present cases where a police officer making an honest split-second mistake has been sentenced to jail.