A annoying as it is to many for the US as acting as protector of wealthy Arab oil states the reverse is worse. No US or great power to exert some control over the sheiks leads to general chaos in a vital part of the world. That is pretty much why Great Britain acted as the Gulf hegemon. It grew out of the armed chaos in the Gulf which was generating piratical depredations on shipping in Indian waters. It took a century but that was the basis for that expensive and tiresome activity. Today with the oil sheikdoms the situation is somewhat analogous.
Those who loudly protest this situation should consider they are 75 years late. The meeting of FDR and the King of SA in 1944 started the relationship.
Any disruptions of the Gulf oil supply (primarily to Europe and China) would be temporary and would not be catastrophic. However American deaths would be tragic and could never be recovered. Also every time an American bomb is dropped or American soldiers fire their guns, more and more implacable, needless enemies are created who with their nihilistic mentality will sacrifice themselves to do harm to America. These entanglements are weakening America in many ways.