Is the use of violence justified?

I am very interessted to know if you consider use of violence by Hamas and Hezbollah to defend and achieve to their goals. This is a real debate because we cetainly do not agree that people are killed, but the debate is why are they doing this? Does defend your home, your land or your family make of you a terrorist? Maybe is it difficult to understand because a lot of us have never live in a war context. I do not take a side of one or other because the question here is human rights question and then, as human we should support people who struggle for their rights to live in peace. What do you think?