> A former CIA director said the U.S.-led coalition fighting the Islamic State has been reluctant to attack oil wells controlled by the extremist group partly because of environmental concerns. http://www.washingtontimes.com/news/2015/nov/25/michael-more...
Suddenly the US becomes the protector of mother earth?
Any tactical enemy-of-my-enemy-is-my-friend inclinations towards supporting ISIS that Saudi might have are are also rather tempered by the fact that wresting control of Mecca from the American-allied kleptocrats of the House of Saud is rather close to the top of the Islamic State's to-do list. Which actually makes them more of a threat than Assad or Iranian-backed Shia militias
The suggestion that Turkey is a sufficiently influential ally for the US to not just disregard but actively encourage cross border black market oil trade with ISIS is almost as silly.
ISIS are Sunnis. Saudis are Sunnis. Iran, Syria are Shia (as are Hezbollah). That's one factor. The other is: some regimes have it in for Assad; they want to get rid of him. They'll support anybody taking on Assad. That's another factor.
ISIS being Sunnis actually makes them more dangerous to the House of Saud, since they represent a challenge to their legitimacy as rulers rather than their population's natural enemy. Similarly, the US damaging the ISIS economy and prestige actually strengthens Saudi Arabia's position as the benefactor-of-choice for aspirant Sunni militants.