You fundamentally misunderstand SA. The wahhabists and the house of Saud have a symbiotic relationship. The royals turn a blind eye to the excesses of the radicals, provided it's targeted externally, and in return the radicals legitimize the rule of Saud as a theocracy. This is why the royals suppress violent actions within their borders, but not the structure that ultimately causes those occasional acts of domestic terror, while doing nothing to hinder how those same networks do terror internationally, including 9/11.