The heartbreaking violence in the Middle East, Ukraine, and elsewhere carries many messages, but here's one Americans shouldn't miss: The United States — no matter who the president is — cannot manage world conflict. The corollary is that when a president tries to manage it, things will usually get worse. Foresight is always defective, and tragic unintended consequences will prevail. The foreign-policy "experts" in both major political parties, and the intelligentsia generally, think otherwise. No matter who holds power, we can expect the opposition to complain that the chief executive poorly anticipated and thus improperly responded to world events. If this charge weren't so ominous, writes Sheldon Richman, it would be comical to hear Republicans berating Barack Obama for failing to be "proactive," for repeatedly being caught by surprise, and for not exerting "American leadership" to keep the world's hot spots under control and, most important, in harmony with "American interests."