I don't know, I'd say it frightening that people could believe such a huge "conspiracy of silence" would envelop the hundreds of thousands of people who live and work in the area.
It's like the true believers who think no airplane crashed into the Pentagon, despite the Post's published accounts of close to 100 people sitting in Crystal City office buildings or stuck in the daily 395 traffic jam directly adjacent to the Pentagon. Jeepers, my Verizon telephone guy heard it going right over his head (he must be a CIA plant).