As one reads through the Sunstein/Vermeule article it is clear that the authors, while aware of the now infamous Popular Mechanics article -- that absurd prop for the official governmental account (pg 18) -- have carefully avoided any relevant material from within the mountain of easily available credible information that would dash their thesis. For academics ostensibly wedded to truth this is shameful.
Consider from page 20 the following misrepresentation of the position of the 9/11 Truth Movement:
"After 9/11, one complex of conspiracy theories involved American Airlines Flight 77, which hijackers crashed into the Pentagon. Some theorists claimed that no plane had hit the Pentagon; even after the Department of Defense released video frames showing Flight 77 approaching the building and a later explosion cloud, theorists pointed out that the actual moment of impact was absent from the video, in order to keep alive their claim that the plane had never hit the building. (In reality the moment of impact was not captured because the video had a low number of frames per second."
This is a classic "straw man" set up to be knocked down. The intensely grainy few frames made available (of the many certainly detailed security camera records that exist) were not adequate to identify Flight 77. But in this instance it is beside the point anyway, because 'moment of impact on the video' was never a central issue in a case consisting of an abundance of strong evidence. The authors certainly know this as they seek to create the false impression that 'moment of impact on the video' is the centerpiece of the 9/11 Truth Movement's case, an impression the authors can then refute.