Reminds me of a talk I heard once, where the speaker was trying to find a dividing line between the 'terrorist' and 'freedom fighter' ideas. ... In the end, this was part of his dividing line: the 'freedom fighter' starts off trying to do things the legal way and resorts to guerrilla warfare when it is the only option remaining; the 'terrorist' actively works to ensure that guerrilla warfare is the only option to maintain its own group coherence.