Talking about conspiracy theories:
The whole official 9\11 reports seems a bit fishy and there were without a doubt cover-ups and misinformation involved, but so far I have yet to read a convincing alternative theory. Most of them start promising and in the end they turn out to be just another "oh my is the world complicated, oh I know, a small power elite caused all this, now I understand!"-shit.
Well, but that's how it is. That's why
they did it.