I remember in my livingroom watching the news just after 9/11 and the guy was reporting the fbi found a passport of one of the hijackers a few blocks from ground zero. Now im not a bloody physics major but:
fireball
paper passport
thousands of bodies that died in those towers never be found
within days paper passport
And the fbi called to do a press conference that they found it. And why? Becauase they know that people not retain detail, they retain an image , especially from tv, and therefor what they do they re feeding the cover story, is they feed an image, and the image they wanted to feed at that time is that the official story was true.
'''Hey we found a passport from the hijackers''
then the people can say '' heyy they were right, it was them people'' (and they shut about it)