Interestingly, Martin Amis makes an explicit case linking terrorism WITH boredom and ennui in his latest collection of essays.

It's hard for people who truly love the world and the people in it, who are filled with love and hope, to see the need to turn to violence. I'll look tomorrow and see if I can't find some of his quotes on the matter, because he is really interesting (and he always writes so beautifully too).