Ferguson: too much or not enough?

[Esquilax]

That's funny, I didn't know you Yanks had the death penalty for robbery.

The death penalty can be carried out by citizen in a position to stop a felony crime, intentional death or seriously bodily harm. (That is why george Zimmerman was not even initially detained after killing treyvon.)
In some states one can add the crime of tresspassing or even property damage.

So beating up a cop is indeed a crime the officer has the right to be judge jury and executioner.

That it is why people/smart people do not start fights with people whos jobs require them to be armed.

Interesting. Does your country always escalate immediately to lethal force? Because in my country there's a little thing you can do where you don't shoot to kill immediately, least of all- what was it?- six times in succession. If you have to shoot at all, put one out there, or better yet, use a taser!

You can't say "oh, he attacked a cop so his immediate execution was appropriate," because that's not actually the only option available, nor even the easiest option, or the most morally acceptable option. If the cops where I am can manage not to gun down every guy who rushes them, there's no excuse for anyone else to.