Quote Originally Posted by Marcus View Post
The world’s only superpower was helpless at the humiliating mercy of a few undistinguished Arabs.
In my opinion, that is far too emotional a statement to being able to explain anything at all. Besides, following the same logic, the same world's only superpower was also unable to prevent a series of US embassy bombings in Kenya and Tanzania in 1998. Were those bombings designed by the US government either?

No one was held accountable for the greatest failure of national security in world history. Instead, the White House dragged its feet for a year resisting any investigation until the persistent demands from 9/11 families for accountability forced President George W. Bush to appoint a political commission, devoid of any experts, to hold a pretend investigation.
Now, that is serious. That tells me the US government knows who did it but it does not want to officially recognize it. Because, if they had, the whole situation would probably spin out of control. But, again, that does not prove the US government was behind the design of 9/11.