No US strategic national interests are served. The alliance with Saudias has brought nothing but misery to the USA. Misery and thousands of American lives lost.
I lived in the Kingdom for five years including during the entire Gulf War, i.e., Desert Shield/Storm. I lived two years in Iran including during the fall of the Shah and the entrance of Khomeini. If you are foolish enough to believe that the removal of the SA Royal family will not cause a huge vacuum that will be filled by someone far worse to our interests, then you have lost touch with reality.
OBL hated the Saudi Royal family and wanted to take them down. He said so in his two fatwahs, especially the 1996 fatwah, "Declaration of War against the Americans Occupying the Land of the Two Holy Places"
The youths hold you responsible for all of the killings and evictions of the Muslims and the violation of the sanctities, carried out by your Zionist brothers in Lebanon; you openly supplied them with arms and finance. More than 600,000 Iraqi children have died due to lack of food and medicine and as a result of the unjustifiable aggression (sanctions) imposed on Iraq and its nation. The children of Iraq are our children. You, the USA, together with the Saudi regime are responsible for the shedding of the blood of these innocent children.