Whether violence is a means to an end, or just and end to some people, you can't stop those who choose violence over civility with anything other than appropriate force. If someone wants to beat you up, the best way to stop them is to deliver a blow that makes fighting too difficult. If somemone wants to kill you by pressing a button to detonate the bomb on their chest, the only appropriate force is to stop that button from being pressed by any means necessary, even if it means a bullet between the eyes.

Ricardo, I want to reiterate one of Warbler's questions: Don't you believe there is ANYTHING worth fighting for. Don't you believe that liberty, the freedom to live the way you choose, to think the way you want to think, to not be afraid of your government or the lack thereof, is WORTH fighting for? If you don't think these basic things that all humans hold as inalienable rights endowed to them by their creator, then WHAT can be worth fighting for?

Because the way your posts are coming across, your answer seems like it would be "nothing"...