Er, yeah...
One Issue: Using 9/11 as an excuse, they invade Afghanistan, a country with no natural resources and important only for the dozens of Fundamentalist training camps. In your mind, they were willing to develop a conspiracy employing literally hundreds of people to attack themselves in broad daylight so they'd have an excuse to what, blow up terrorists?
Other Issue: Using WMD's as an excuse, they invade Iraq, a country that's strategically important to the region and sitting on a bog load of oil. And here, according to you, its perfectly logical that with all this to gain they weren't willing to develop a conspiracy involving one dude with a truck?
Pffft, yeah, whatever dude.