Nonsense. Nothing would have been done to stop 9-11, because nobody would have believed it, even if Osama himself gave the warning on live TV. What would we do, cease all flights on the Eastern seaboard for a month? (And then the Muslim murderers would simply wait another month to do the deed.)
Might have saved the dead sailors on the Cole...
Consider that we have been warned -- 911 did happen -- and yet a sizable minority wants to do away with the safeguards that have prevented a recurrence.