I think what we see in today's world is the power of information. Much as the agents provacateur model, we have the disinformation model.
You know, there are some very real questions, an incredible list of "coincidences". But when people start talking about holographs, and missiles, and the planes not being real .. well that to me sounds like plants to discredit it all.
The use of cell phones at altitude at the time is questionable at best. The ability of the pilots to fly as those planes flew, is highly questionable.
Here is a bit on the coincidences:
And the whole site -- it's a great place for conspiracy theorists: