For me, the damning thing about all these 9/11 consipracies is that they make no allowances for coincidence.

A light spot on the bottom of an airplane in a blurrily zoomed image is a missle - not a blurry reflection.
The manor in which the towers collapsed proves it was demo, not just a building falling in on itself. I mean, how else do you expect a building that's barely leaning over to fall? It's not a tree being chopped down fellas, it's a building whose core has been partially gutted and substantially weakened.
The fact that a man had a conversation about death with his child the day before he boarded a doomed flight is proof that he was in on the plan - not just happenstance. How often do we all have such coincidental conversations? Seriously.

I guess what I'm trying to say, is that more often than not minor details are minor details; even when there's a lot of them. I mean, take for instance the appearance of the Virgin Mary in a grilled cheese sandwich, or a bagel, or a potato. Is it some kind of conspiracy? Or might it just be an odd little coincidence.

The real flaw in it all, however, is something that every well devised plan (as the attacks of 9/11 were a major undertaking) always requires. Motive. In the late nineties and early 21st century, the US government had nothing to gain by attacking it's own nation and fingering a terrorist organization that was virtually (at that time) unkown to the public. Al Qaeda on the other hand, a group who (still) operates under a transformational ideology supported by a violently twisted religious belief; not only had motive, but has since claimed responsibility and pride over the events of that day and many similar events since. Motive bitches. Motive.

See, these consipracy buffs are searching for something that will complete the picture for them, tie up every little loose end. But as the Virgin Mary might tell you, sometimes a grilled cheese sandwich is just a grilled cheese sandwich. For something to make sense it has to work on a macro level as well as an operational level. Because if it doesn't, it's just a bunch of Loose Change. And as we all know, that and a dollar will get you a cup of coffee.

As an aside, I'd have to be pretty damn desperate and lonely to cash in your fifteen minutes on something that makes 2/3rds of the US population think I'm an assbag.