Saudis have no problem self-sabotaging if theres a greater reward at the end. Case in point - 1973 oil embargo or the current oil price war to fade out shale/fracking
Those are not equivalent stories. Competition over market share with shale producers is not the same thing as an embargo. Lower oil prices are actually a boon for American consumers, unlike the latter. Competition for market share also doesn't mean Saudi stops exporting to the U.S. market . Besides it hasn't been successful. Shale production is reaching record production levels this year and has been one of the few areas of growth for the oil majors.
Now ask yourself why there has never been a possibility of an embargo after 1973. In 1973, a much smaller percentage of Saudi oil wealth was invested in the U.S. and its security ties were much less extensive. Can't say the same on either front in 2017. Same for this story. What exactly is the long-term aim that Saudi could hope to achieve by "sabotaging" a refinery that they own? Its actually part of ARAMCO's plans to diversify its holdings in light of the challenges its faced as a result of shale growth.
Analyzing this through: Trump/Obama, conspiracy, or terrorism will lead to pretty poor assessments.