And this a factual statement: there is no evidence of Osama bin Laden's prior knowledge of, or involvement in, that attack.
According to the 9/11 Commission Report, the 9/11 plotters spent between $400,000 and $500,000 to plan and conduct the attack. That funding came from al-Qaeda through Khalid Sheikh Mohammad to the operatives who used it to travel to the United States and to train for the mission. That's the official story – except that US government has never been been able to determine the origin of that money or to recreate a money trail linking it to the groups they claim provided it. The 9/11 Commission Report: "we have seen no evidence that any foreign government – or foreign government official – supplied any funding."
In other words; the official 9/11 Commission Report (released in 2004) identifies al-Qaeda and Kalid Sheikh Mohammed as the source of the funding for the training and execution of the 9/11 WTC tower attacks, without being able to find any direct evidence of that funding, or of support or funding from any foreign government (that is, the Taliban).
No direct evidence of the involvement of al-Qaeda or its founder, Osama bin Laden, has ever been discovered.
Whatever happened that day, and it is certain that we will never know the truth; the outcome was absolutely no different from a false flag operation. Believe the official account if you wish, but do not pretend that it has been proven to the satisfaction of every reasonable doubter.
For one thing; it has never been proven that Osama bin Laden was involved; and the whole damned thing was pinned on him. He was a convenient scapegoat. Stop right there – that's reason enough for me to doubt the rest. The official 9/11 story sounds like some lunatic conspiracy theory anyway.