This guy is a complete fool. I heard yesterday from the College Republicans that the goofy prof from Wisconsin who was teaching that 9/11 was a inside job got the hook and will never teach there again.
Fools can be dangerous at times.
it is quite different to suggest that they can threaten the existence of the United States.
Sure, and the invading hordes of barbarians didn't threaten the existence of the Roman Empire. Also, one equals two! </sarc>
Only a fool is unable to connect the dots and see that the terrorists wanted to destroy (or disable) the financial (New York) and governing (Washington) centers of the United States.