Ha, well in part because I am trying to frame this position for the HN audience. And also because it's an extremely serious claim, though even without the foreknowledge component there is clear criminal behavior on the part of multiple US administrations.
I didn't know about the French journalist you mention, but I am aware of
* Dozens of foreign governments warning the US in advance
* The CIA puting a memo on Bush's desk a month before detailing an imminent terrorist attack involving hijacking planes
* Identification of the hijackers by multiple FBI agents, who in some cases had informants living with the hijackers and who were aware that in flight school the hijackers were uninterested in learning to take off and land planes.
* Able Danger, a SOCOM and DIA effort that identified 2 of 3 Al Qaeda cells active in the 9/11 attacks, including ringleader Mohammed Atta up to two years prior to 9/11
* William Binney claiming that the NSA did have the raw intelligence to uncover the 9/11 plot, though that intelligence may not have been processed in time.
* Historically similar plans for a false flag like Operation Northwoods
* The death of Iraq weapons inspector David Kelly, just two days after being questioned aggressively by the Foreign Affairs Select Committee
* Various whistleblowers like Susan Lindauer who claim to have had foreknowledge and tried to warn their superiors
* Wire transfers from Bandar bin Sultan, the Saudi Arabian ambassador to the US under Bush, directly to two hijackers. Bandar is also implicated in illegal arms dealing and is so close to the Bushes that the family themselves nicknamed him "Bandar Bush".
* War games on the day of 9/11 that were remarkably similar to the real event, and confused the response effort.
So, I agree. It's more likely than not certain people had foreknowledge and exploited it for the purpose of war profiteering. Even though I have been reading about this for a long, long time, sometimes it's still hard to imagine that anyone could be so wicked.
https://en.wikipedia.org/wiki/Bin_Ladin_Determined_To_Strike...
https://en.wikipedia.org/wiki/David_Kelly_(weapons_expert)
https://en.wikipedia.org/wiki/Able_Danger
https://en.wikipedia.org/wiki/Bandar_bin_Sultan_Al_Saud
https://en.wikipedia.org/wiki/Operation_Northwoods
https://en.wikipedia.org/wiki/September_11_attacks_advance-k...