Bomb Iran but Blow Up NATO?

Could the Iran war do what even Vladimir Putin couldn’t and blow up the North Atlantic Treaty alliance? That’s no longer an idle question as most of Europe refuses to help the U.S., and President Trump responds by threatening to leave NATO. This would be the dumbest alliance breakup in modern history. The immediate fault here lies with Europe. Spain and Italy are blocking U.S. military flights for Iran from their bases, and Mr. Trump says the Macron government has blocked flights over France. Add its reluctance to help clear the Strait of Hormuz, and Europe is playing into every...