15 of the 19 Sept. 11 hijackers were financed by the Saudi government and traveled on Saudi passports. Both the 9-11 Commission and outside agencies found numerous instances where the Saudis housed terror groups and financed their existence. There was more than a 100 pages of allegations made against the Saudi government by the 9-11 Commission that GW Bush ordered excised before the final report was issued.
If the U.S. had REALLY wanted to avenge the 9-11 attacks, our military should have invaded Saudi Arabia instead of Iraq.