None of this should be in the least bit surprising. The US has been working covertly with Saudi Arabia and British military intelligence for more than three decades to foster and fuel al-Qaeda extremists, beginning in Afghanistan to fight the Soviet Union from the late 1970s until 1990.
Since then, al-Qaeda has served as a protean ideological cover for imperialist predation in the Middle East and beyond. It has undergone many reinventions with mercurial name changes along the way. But the bottom line is that it is a Western(+militant Zionist)/Saudi creation, which alternates between an enemy of convenience and a ruthless proxy for waging regime change.