小心不要濫用"恐怖主義"這名詞。定義可wiki一下

http://en.wikipedia.org/wiki/Terrorism

Terrorism is the systematic use of terror especially as a means of coercion. At present, there is no internationally agreed definition of terrorism. Common definitions of terrorism refer only to those violent acts which are intended to create fear (terror), are perpetrated for an ideological goal (as opposed to a lone attack), and deliberately target or disregard the safety of non-combatants.