President Lyndon B. Johnson once said that the first rule of politics is to learn how to count. By that reckoning, Benjamin Netanyahu is a singular failure. The two-state solution to the problem of Palestine, which the Israeli prime minister has now publicly and explicitly rejected, has long been seen as the only viable way to preserve Israel’s security and its identity as a democratic Jewish state. That cannot be detached from the Palestinians’ right to a sovereign self-governing homeland.