You have to understand the simple reality...Saudis fund the Wahabbists, big time. You see the Saudis basically pay them blood money to keep them from attacking them... Every radical wahabbist expansion and attack is directly tied to the Saudi Government.
Like the Danegeld, which will never really rid you of the Dane?
Very very foolish of them, since Allah can get mad at them too at any time for any reason.
But anyhow, if Wahhabists, whom the S.A. are vainly trying to pay off, should in turn make plans in S.A.’s sight to attack the USA... why still would they not want to warn the USA, their best customer. It seems all downside for them.