Giood article, Laurence.
The problem is that terrorists have a lot of patience, can hide for years, know very well how not to get cought (by for instance avoiding the internet or whatever technology we use) and most importantly, have a lot more imagination than we think.
They strike when we think we're safe (that's why I'm not astonished by REB's number of replys in this thread.
Vengeance is a meal that's eaten cold (la vengeance est un plat qui se mange froid) as we say (vengeance waits a long time).
And they use our own weapons against ourselves, or very conventional ones or their willingness to end their life on the spot.
But I'm not optimistic we can out-imagine them, so to speak. It's like our club's publication: we give a copy to someone else to correct the mistakes, before we print the magazine, as it's well known others can far more easily see our own mistakes than we can.

Terrorism is far from over.

Raoul