9/11 was a justification in order to go to war with the Middle East. "How do we get the American people to support a pointless genocidal war with no questions asked?" Blow up some huge buildings with a suspiciously low amount of employees in them!
I hate to be captain conspiracy, but I would not be surprised AT ALL if the whole thing was a big fucking charade. Even if it wasn't a charade, I know we gave them the means to do it.
PowderHound and TreeNinja