As long as a foreign nation or group is willing to conduct business using U.S. dollars as their medium of exchange, the U.S. government will move mountains to make sure even the worst people among them are never held responsible even for attacks against the U.S.
Why do you think the U.S. set out in 1990 to protect a radical Islamic royal family in Saudi Arabia from one of the more benign dictators in the Middle East in the first place?
We have been working to overthrow one secular dictator after another, only to replaced with Islamists. Why is that?
Good question.