Fallows on Ignatius on Sageman. The great unanswered question of the last six and a half years is: why haven't we been attacked again? There are logically two - not necessarily exclusive - possibilities: our defense has been getting much better; their offense was over-rated. I suspect that technology, good police work, and plenty of heroic stories that neither you nor I know about have made a difference. But seven years is a long time. And Bush is not exactly Mr Competence, is he?

Have we misread the world - and over-estimated the threat - even more profoundly than we realize? That is the question.