David,

It's an open secret that Wahhabism as defined by the Saudis is the state ideology of the kingdom. The clerical establishment is given great leeway and deference, as well as practical control over many of the government's ministries, including education. What is the difference between the extremists in the Saudi government and the extremists picking up arms in Syria, Iraq, and elsewhere? And we should also question exactly what information the Saudi population receives about ISIS anyways - what's being said in the mosques and the schools? Given the widespread discontent in KSA, it would not surprise me at all that Saudi supportive opinion of ISIS is well north of 50%.