The Sept. 11, 2001, terrorist attacks created an atmosphere of anxiety and uncertainty. No one knew how many more large-scale attacks were in the pipeline. Might more Mohammad Attas already be in the country making the final preparations for new 9/11s? Were armies of terrorist “sleepers” awaiting their wakeup call?
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Brian Michael Jenkins is senior adviser to the RAND president and the author of “Al Qaeda in Its Third Decade: Irreversible Decline or Imminent Victory?” and “The Dynamics of Syria's Civil War.”