Good God, you are so retarded. The cops were in the act of making an arrest for DUI. You don't take the plate number and arrest someone later.
The fucking asshole had already struggled with the cops once, stolen the taser of one officer, fired it at another (and it can seriously injure if you're not trained on its use, the probes can penetrate skulls, eyeballs, arteries, etc.) and in the course of fleeing fired it at one of the officers.
The officer could not be certain that he was not otherwise armed, either.
Justified shoot. Bullshit charges.
And you're a fucking idiot and should seriously look into changing your diet to tide pods and bleach chasers.