Wake up Carol, they did not need this elaborate plan to get the results - that is what negates this theory. Simply flying planes into those buildings would have the same results - there was no need for demoltion, the damage was done and the motive would have been there.

Simply flying planes into those buildings would not have produced the same results. A bomb went off in one of those buildings a few years previously and it didn't produce the same result at all. And insurance money can be a powerful motivator as well. Plus the destruction of quite a few documents that could incriminate people who were currently under investigation. It's a perfect storm, Ron. The motive is there. Several motives, in fact.

The people of the US had to be terrorized utterly and completely in order to convince them to back a policy of pre-emption and endless war. Nothing less than an all out effort could be undertaken because if just flying planes into buildings didn't produce the desired result, the people who were responsible would have taken an enormous risk for nothing. The stakes were just too high for them to not get it right in one go.