We supported Israel. Plain and simple. Even as UK/Europe had abandoned it.
That is America’s main legacy in the region and its what grounds us moving forward.
The preoccupation with Iran's brand of Islamism while turning a blind eye to or supporting Sunni Islamism reflects this skewing of priorities. Iranian clerics have Israel as their main target. Wahhabi Sunni clerics have Europe and America as the main target of their hatred. None of the 9/11 attackers were Iranian or Shia. Neither were any of the ISIS-inspired recent attacks on America or its NATO allies.