There's an interesting article in the American Conservative regarding the attack on Saudi Arabia that temporarily took out 50% of Saudi oil refinery capability.
Gareth Porter at the American Conservative makes a good case Evidence of Iran's Role in Attack Doesn't Matter.
A set of complex issues related to different Iranian and Houthi weapons systems and other forensic evidence surrounding the destruction at Abqaiq will be the center of attention in the coming days. The forensic evidence presented by the administration may be weak or persuasive, but in either case, it would be a strategic mistake for those who oppose the war in Yemen and America's involvement in it to make this the story.
It is obvious that whatever the precise nature of the strike, Iran likely played a role in both creating the drones and/or cruise missiles involved and in the strategic rationale for it. But one can argue that both the Houthis and Iran had legitimate reasons for carrying out such a strike.