The tenuous, perhaps complacent, sense of quiet is unravelling in the Levant. For the past two weeks, reports that Syria has delivered Scud missiles to Hizbollah, or at least is ready to deploy them across the Lebanese border, have reminded everyone in the area that amid the hubris, a devastating war is only one miscalculation away. Hizbollah’s possession of such a strategic capability would change the game because it would allow it to target the entirety of Israel from its northernmost bases. The real benefit would be psychological, because Israeli confidence would undoubtedly be shaken if the entire country became...