[hobbes1]

One thing that I have learned in my short time here is that very, very seldom do you find a case where a noble end justifies a barbarian means to that end.

Sadly, one of those cases, is when dealing with barbarians that target innocent civilians, and the loss of innocent life is (in an intelligent estimation) imminent.

Is it barbarian to injure, or kill an avowed terrorist, or allow an innocent to have his life taken ?

[Just another Joe]

Is it barbarian to injure, or kill an avowed terrorist, or allow an innocent to have his life taken ?

Injure or kill, in the heat of the chase, or during a firefight trying to capture the terrorist? No.
Torture? That just brings the US down to the terrorists level and gives them a justification for hating and wanting to hurt any US citizen. I know that a terrorist doen't need any justification but it could justify the terrorist in the eyes of the rest of the civilized world.