Personally, I haven't the foggiest idea who or what "Al Qaeda" really is or why I should believe that this nebulous "terrorist network" is solely responsible for the 9-11 attacks -- or even capable of carrying out such an operation.
Granted, the talking hairstyles on television have been urging me to draw this conclusion ever since 9-11. But, for some reason, I am hesitant to take their word for it.
I presume you have some authoritative data to back up your "lone terrorist network" theory?