Q: Why were there no "investigative reports" on Bush's (and his admin.'s) failures weeks after 9/11?
A: There are a number of reasons:
* The only people who had the facts were potentially culpable and held security clearances - none were in the habit of talking openly about the compartmentalized CIA-DoD programs that allowed the hijackers to enter and roam freely around the U.S., in some cases for years before the attack. The operational guys at CIA-Counter Terrorism Center (CIA/CTC)under Cofer Black and Rich Blee were so concerned about security that they even withheld files from the FBI I-49 National Security Unit when John O'Neil's agents started demanding a look a certain files in June and July, 2001 that identified the Flt. 77 hijackers, who had been under CIA and NSA surveillance since 1999 and were apparently treated as double-agents of one or more allied intelligence agencies. The CIA, the NSA, and the uppermost echelon of the FBI had a vested interest in obscuring responsibility for operational failure, and in suppressing or deflecting the facts, because they had professional responsibility for managing the risks of this high-stakes program, and spectacularly failed in their duty.
* Bush was briefed repeatedly by Tenet in the months and weeks leading up to 9/11 about the threat, and Tenet flew to Crawford suddenly on either August 17 or the 21st to talk again to Bush. Tenet later perjured himself before the 9/11 Commission in his testimony about that. The Flt. 77 hijackers were watchlisted, but, only in such a way that they would be prevented from leaving the country. Bush basically said to his CIA briefers, "OK, you've covered your ass now." It was Bush's call not to roll-up the al-Qaeda cells known to be plotting hijackings and attacks upon "high-visibility targets" in NY City and DC. Bush was CIC, it happened on his watch - he needs to be held responsible, but probably never will. The American form of Gov't isn't set up to deal with such issues and to impose accountability at the top. It's a limited liability corporation.
* The corporate media operates according to the rule that they will never, ever publicly reveal classified programs, even those that have failed spectacularly. The few exceptions to that prove the rule.
If you want to read more details about the how and why of this greatest of intelligence policy failures, please see,
http://www.dailykos.com/story/2009/12/4/810764/-Erik-Prince:-American-Bin-LadenCIA-Asset,-MoneyGunmen