Well your government does protect them, make special excemptions for them (democracy rights etc). The USA jumps to becomes the world moral police if you have oil, are a dictator, and aren't selling your oil to the US on their terms. However if you have oil, are a dictator and are selling it to the US on their terms - everything is hunky dory.
How long with the House of Saud last if they faced the same sanctions as Iran - an equally repressive regime? What about Israel? Just because they elect the people who oppress the Palestinians, does that mean they should avoid the sanctions the world placed on South Africa or Zimbabwe.
Your govt can't wash their blood/oil soaked hands of their role in this. All around the world your government supports evil, as long as said evil-doers are friends of American interests in the region. It's not hard to see why people hate your government if you take off your stars and stripes tinted sunglasses.