Why? We have sold Saudi Arabia billions of dollars of military equipment, training, etc. They should defend themselves, not look to us to take care of them. Besides, they are not our friends, they fund and their citizens participate in terrorist attacks against the US.
If the attacks on Saudi Arabia were from rogue elements that benefit from a ME war, all they’ll have to do is hit our troops that are there for defense? And we’ll end up defending a country that shouldn’t even exist.
The Sauds have never been our friends. They are double dealing untrustworthy and inept. American forces are just their hired help, their rentals. Nothing else.
It has been decades since I have been in the ME but I doubt their character or competence has changed. I doubt they could operate anything more complex than a toothbrush—not that they would bother to own one. ANY weapon system they employed would have to have Americans behind it.