For the record, the gap in the Dept. of Defence was wider than 5 metres as reported by the conspirationist creed;
though they help Jones to sell DVDs in his enjoyment of liberalism.
We should also remind that the same Cia avoided an attack by a Pakistani integralist in the 90's (not to mention many of its agents who were killed during the 'war on terror'), alas losing some of its own 'mythical' character, enjoyed by conspirationism.
did the US really need such an event as a casus belli?
It is not a mystere that bourgeois economics is sadly famous for never being able of predicting in its history both booms and slumps.
Again, we cannot say with precision.
It appears that the US authorities couldn't predict the exact events for the day of 9/11 or could predict something but during the long minutes of the attacks; "long minutes" for Capitalism in general, hit by its backfire.
(it is important to point out that these 'years', however, undoubtedly justified the ongoing war on Terror)
Whatever the answer is, dialectics simply asserted itself as true and kicking.
[*] (which in its perfection was almost hit in the 90's by a Pakistani jihadist)
[**](who did have the 'weapons of mass destruction', but when the US was supporting him)