My theory on 9/11:
AQ did it.
The Mossad was operating in the US under the guise of Israeli Art Students watching the hijackers at the request of US intelligence agencies. The Mossad reported back to the Americans but did not relay any information they learned indicating a coming attack. The US was caught by surprise on 9/11 because Israel did to tell what they knew.
KSM ran the operation in the US, and meet groups of hijackers in Las Vegas on several occasions.
The plan on 9/11 by AQ was to takeout the Twin Towers, the Pentagon, the White House and/or Congress and the assassination of President Bush in Florida. Other planes were part of the attack but were grounded. These would-be hijackers ran from the grounded planes.
The planned Bush assassination plot that morning was similar to the assassination of Ahmad Shah Massoud in northern Afghanistan two days earlier with the use of a exploding camera. The explosives in the camera was prepared days earlier by Atta using a "Mother of Satan" explosive mixture.
There was no military stand-down. One passenger plane was almost shot-down over Ground Zero (one missile hitting WTC 7 and another flying into the Hudson River). The hijacked plane over Pennsylvania was downed by an American fighter.
WTC 7 was a controlled demolition to prevent the building from toppling over into the search and rescue area.
The anthrax attacks that followed over the next few weeks was a Mossad operation that was initially planned as early as 1998 but was moved up as a follow-on to the 9/11 attacks. The anthrax attacks were designed by Israel to get the US to attack and invade Iraq. The anthrax came from their bio-weapons lab in Nes Ziona.
