Eh.. I don't see this one catching on like the others. Every good conspiracy theory needs an extraordinary outcome to justify the time and energy the perpetrators supposedly put into planning and execution. For the Truthers, it was two wars in the Middle East, and for the Birthers, it was the election of a president unqualified to serve.

I personally believe FDR had knowledge of an impending attack on Pearl Harbor and let it happen to create a suitable environment to pursue his interventionist intentions. Again, the outcome is big and important enough to justify the conspiracy.

In this case, however, such a conspiracy would require the cooperation of hundreds if not thousands of people - all committed to an outrageous lie. But what was the outcome? The author of the site says it was to push an anti-free speech, anti-gun agenda, yet no significant legislation of any kind has emerged from the tragedy. The president wrote an anti-gun op-ed in the local paper, and that was it.