You can have disdain for police but a rabid dog that will openly target them is an absolute danger to all and conjures fear in police. He has lost his conscience and any moral compass. That is one individual to fear along with stupid pig jihadist, they have no right to life anymore.
Are you talking about the police who try to muder innocent newspaper delivery people or are you talking about the former policeman. What the cops did in this case is attempted murder, period.
If this is how the police respond to a single gunman, what will they do when TSHTF, and they face forces that outnumber and outgun them? I suspect they will shed their uniforms and run.
Then you need to change your screen name to: Resolute Conservative Vigilante