KSA and the Wahhabi Salafi Takfiri Terrorist Narrative
This is a good write up and follows what I know of the links. The key to me is that the Wahhabi sect was a loosely held group of armed and very dangerous group of tribal wanderers of the Saudi Peninsula sort of the Gypsy's of the desert.
The House of Saud, wanted to make a kingdom of the Arab Peninsula, but did not have enough power to do so, so they made a deal with the Wahhabi sect to use their warrior's and in return the sect, would get the religious and educational duties of the new kingdom, and the house of Saud would rebuild and protect the great shrine's of Islam.
Part of the deal was evangelical work would be by the sect, paid for by the Kingdom of Saudi Arabia, which is why so much of the spread of Islam is by this very militant side of the religion.
But do not forget most of the princes of the House of Saud are not as wealthy as some would believe and have been at these schools run by the sect, and are pretty much indoctrinated by their version of Islam.
Another problem is that many Saud Prince's are not in the real power and wealth of the tribe, and always have had turf wars over the running of the KSA. Often they try and make side deals with the religious sect to take over and run the Kingdom as a true Islamic country, or at least their version of it.
Many of these mini take overs have been beaten back over the years, but it is always simmering under the surface. Any time an ISIS is coming to power, it makes the House of Saud and for that matter all the Kingdoms in the area at risk. That is why Osama was banned when he became powerful, AQ became a risk to the rulers in the region, but the not in power Prince's saw this as a way to take over, which is another reason they tend to back the ISIS's of the world.