The dirty little not-so-secret behind President Obama’s much-lobbied-for, illegal and strategically incompetent war against Syria is that it’s not about Syria at all. It’s about Iran—and Israel. And it has been from the start. By “the start,” I mean 2011, when the Obama administration gradually became convinced that it could deal Iran a mortal blow by toppling President Bashar al-Assad of Syria, a secular, Baathist strongman who is, despite all, an ally of Iran’s. Since then, taking Iran down a peg has been the driving force behind Obama’s Syria policy. Not coincidentally, the White House plans to scare members of...