There are a ton of other sources for cheap gas—Iran, Venezuela—and gas we are currently exporting for some reason that could be used by our people. Going to the Saudis and begging as the leading superpower and the only thing keeping them in power is more pathetic than building up our relations elsewhere.
Because throwing someone in prison for protesting against a government's ruling party is an unacceptable violation of human rights that we will not stand for.
But chopping off someone's head because a guy with a big wizard beard said they were practicing witchcraft in violation of Sharia law? Totally fine.