There is more Bush family involvement in 9/11 than the American people know---involvement kept out of the news, despite being very pertinent.
Sample: The firm contracted by the Cheney/Bush administration to provide "security" for the World Trade Center (WTC), for Dulles International from whence two 9/11 planes flew, and for United Airlines (two 9/11 attack planes were United) was Securacom (changed to Securatec, Inc. post-9/11), whose Board included three Bush relatives: maternal uncle Wirt Walker I (Board Chairman), maternal cousin Wirt Walker III, and GW's brother Marvin Bush.
Riggs Bank, found to have laundered money for two of the hijackers through the wife of Prince Bandar, a long-time friend of GW Bush (see Michael Moore's documentary "Fahrenheit 9/11") and also a trained Saudi military pilot who was a loyal friend to the bin Laden family, had the same Bush family relatives on the Board, with Wirt I as Chairman.
The Industrial Risk Insurers (insurers for the WTC and surrounding properties) had Wirt Walker I as Chairman of the Board, and also included both Wirt Walker III and Marvin Bush on its board. Why is this relevant in assigned blame for 9/11 attacks? Look up the names Frank Lowy and Larry Silverstein, both friends with Rupert Murdoch (and fellow Zionists), and then-Port Authority Chairman for NY and NJ, Lewis M. Eisenberg, former Chairman of the Republican National Finance Committee in D.C., well-known to the Cheney/Bush administration.
Six weeks before the 9/11 attacks (July 24, 2001), Silverstein Properties and Lowy's Wesfield America were able to secure the 99-year leases of the WTC for $3.2 BILLION---a fraction of the their value---approved by Lewis Eisenberg. The package deal included the Twin Towers and two nine-story office buildings. Silverstein owned Tower 7---and he called for Tower 7 to be "pulled [down]" eight hours after the planes hit the WTC. The Industrial Risk Insurers (cited above) paid out a whopping $871 MILLION on Tower 7 to Silverstein on his original investment of $386 MILLION---a net profit off just one of the office buildings of $500 MILLION. Hmmm...
Richard Clarke, Bush-appointed head of the NSA, repeatedly warned the lawless Bush/Cheney administration of pending attacks, of al-Qaeda "chatter"...and GW snapped at him angrily, "That is enough! I do not want to hear anything else about al-Qaeda!" and then banned Clarke from attending Cabinet meetings. [Clarke, "Against All Enemies"] Condoleeza Rice testified her office had received written warnings of "foreign pilots being trained" and "al-Qaeda determined to attack in U.S."...warnings that were ignored by Bush and Cheney (on purpose, I firmly believe).
Then-Treasury Secretary Paul O'Neill (Suskind, "The Price of Loyalty") became frustrated when, as he told Suskind, both Cheney and Bush were plotting how to come up with "an excuse the public would buy" for invading Iraq---an obsession for both Cheney and Bush---only four days after being sworn in (and long before the 9/11 attacks were allowed to occur as "the excuse the public would buy"). GW Bush was manipulated, using GW's evangelical extremism as a tool, by the ruthless Cheney, Rumsfeld, and Wolfowicz to see the pending attacks as "a means to a desired end" (based on what Colin Powell's Chief of Staff Col. Wilkinson told investigators later)---the ILLEGAL invasion of Iraq in order to gain a desired foothold in the oil-rich Middle East for Cheney the oilman and his puppet GW. I blame Cheney, Rumsfeld, and Wolfowicz more than I blame GW, but you are correct---the attacks did occur while GW was at the helm, puppet though he may have been.