it's a public secret among media, intelligence community and govt officials in the U.S., nope, in the world, that the Saud family (the ruling Saudi family) financed a lot of charities that bankrolled many of the extrimists Islamic movements, and one of them is the Al-Qaeda at least up until 9/11.
Yet, the Saudi are very rich and very well connected with US oil interest which of course are very influential, even have members among our top decision makers. The fact is even if I could provide you with proves, are we willing to sacrifice our relation with Saudi and stop buying oil from them and pay maybe $1 to $2 more per gallons of gas? and remember the consequences don't just stop at our gas prices, our energy bill, grocery prices will also affected...
Americans are mad at people who is behind 9/11 that killed 3000 of our citizens, yet many of us are also hypocrits enough to look the other way when our pocket are affected....