Most people like that psychologically get a thrill out of being "one of few smart enough not to get duped".
This is one of the two big draws of conspiracy theories. Not only are they the few who aren't duped, they have the ability and duty to save the masses from their "ignorance." The other is the dissonance brought about by an imbalance in the magnitude of cause and effect -- lone gunman versus the president of the US or 19 guys with box cutters versus 3000 people, the twin towers, and the Pentagon. It's almost the inverse of just world theory in that it's difficult to accept that so few people caused so much harm, in this particular case it helps to distance themselves from the frightening reality that that given the motive, the technical means to commit mass murder are readily available to every one of us.
Super sigh. I thought they all gave up on this one point a couple years ago when a gas (car fuel IIRC) tanker crashed here in the Bay Area and the burning fuel melted all the steal components on an overpass causing it to fail and crash down.
Did it definitely melt, or did it just heat up enough that the modus of elasticity and yield strength dropped to the point that it couldn't hold the bridge up? We had a tanker blow up on I95 in Bridgeport CT and people referred to it as having melted the bridge, but the pictures and video showed that it had only severely deformed and there was not any molten steel.
