Just because terrorists perceive they are fighting for justice it does not mean that they are really fighting for justice. India has been subject to mindless terror in the name of Kashmir, on that count alone can it be said that terror is justified?
All new thoughts and ideas begin as minority opinion and acquire acceptance over time. Democracy is the mechanism that serves as a crucible for minority opinion and enables the valid ones to attain mass acceptance, and this includes even religious affairs.
Democratic means are available to establish rule of law and make all opinions heard to fashion a sovereign Iraq, why the terror then? Same is true in Afghanistan. Why do the Taliban terrorists insist on imposing their own brand of dated beliefs on everybody? Terrorism is unholy and senseless means to achieve any objective. Gandhiji equated truth with non-violence. Violent means imply false conclusions and go against the grain of democracy.
