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The US doesn't need to attack with weapons. Arab culture is so flammable & passionate about everything and nothing. All it takes is a spark of internal debate about basic human rights and the whole country would implode. See Iran for reference.
Why do you think freedom of speech is so illegal in these places?
This sounds like they are removing freedom from their oil. Some people don't like that. >

The US wouldn’t dare attack Saudi Arabia. The last time the US was there—as friends to launch an invasion against Iraq it got a lot of Islamic fundamentalists angry because a bunch of non-Muslims were too close to Mecca. They considered it an affront and one of them got a bunch of other fundamentalists to fly airplanes into buildings.
Attacking KSA is a good way to enrage a billion Muslims world wide. They’d see it as a neo crusade.