Three years ago, film-goers were treated to “Salmon Fishing in the Yemen,” which critic Kenneth Turan called a “pleasant fantasy” about the Middle East. Today, of course, Yemen is the hub of a bloody conflict, one which President Obama persists in viewing with equal unreality. Most obviously: Yemen is not, as the administration has touted, a “success” brought about by its “smart diplomacy.” Most importantly: Iran has a plan. Yemen is a vital component. Israeli Prime Minister Benjamin Netanyahu sees that. So does Saudi King Salman (and no, I will not dwell on the pun). His foreign minister, Saud al-Faisal,...