I think the desire some people have for a conspiracy theory is honestly the important and more intriguing aspect of 9/11 than whether or not there was any conspiracy. Regardless of the fact that any solid proof of a conspiracy is never likely to come to light (any confession from an individual, or even group of individuals, will inevitably draw the criticism of wanting attention), the seed has been planted and everyone knows about the 9/11 conspiracy theories, whether they believe them or not. In a sense, it doesn't matter, because all these possibilities are present in the psyche of post-9/11 America.
The 9/11 conspiracy theory(ies) represents a knot in history that people want to see unraveled, convinced of something at its center, when in truth the phenomenon itself, its portrayal in the media, its interpretation by those beyond it, and its impact on culture and politics in the post-9/11 world are far more interesting than whether or not there ever was any conspiracy.
Noam Chomsky and Slavoj Zizek (along with several others; another interesting cultural theoriest who looks at homeland security after 9/11 is Harvey Molotch from NYU) have made it clear that, in the wake of 9/11, the government has taken advantage of a new fracture or trauma at the heart of the American people and the world. We're in a new age of politics and security, that's for certain; but it doesn't matter whether or not the government devised any conspiracy theory to concoct a scenario in which they could manipulate the patriotism and fear of its citizens. They're doing that, regardless of any conspiracy.
The revelation of a conspiracy wouldn't actually point us to anything new. Obviously our government will go to extensive and questionable means to control its citizenry, but we don't need proof of a conspiracy theory to show us that. Their actions in the wake of 9/11 tell us all we need to know.
