True, sometimes this does take violence for it to occur. That does not make the violence right. In a perfect world, there would be no need for violence, and self-determination would exist all over the world. That world does not exist, and for some groups to gain self-determination they must use violence. The American Revolution is a classic example. Would we still be under British rule if colonists had not taken up arms and fought for freedom? Perhaps. Therefore, while personally violence in any form is offensive and to be avoided, in the fight for self-determination, sometimes it is a necessary evil. That is not the way it should be, but the world is not a perfect place, and there are many people who only understand violence and bloodshed.
When dealing with them, sometimes the only way to win self-determination and freedom is to fight back, and fight to win.
Rapoport, David C., ed. Inside Terrorist Organizations. New York: Columbia University Press,.