Violence is not only the reason for Terror.
Hate, greed to have supreme hold over the world is the root cause of Terror.
Hunger of negative thoughts have blurred the truth deep down somewhere.
The actions of beliefs and humanity have been overpowered by misbeliefs.
In the name of faith, preachings of goodness is misinterpreted.
Remember even a child is known by his doings, whether his work be pure and right.