On October 20, 2011, the day that Libyan rebel fighters found Colonel Muammar Qaddafi hiding in a desert culvert, hauled him out, and killed him, President Barack Obama called a press conference in the Rose Garden, and announced that we had “achieved our objectives.” (Hillary Clinton, who was then Secretary of State, put it more archly, telling a reporter, “We came, we saw, he died.”) The previous spring, when the United States had decided to join in the NATO air strikes against Libya, the White House said that regime change was not the objective, and that persuaded Russia not to veto a Security Council mandate authorizing action to protect Libyans from their ruler “by all necessary measures.” Russia was furious about NATO’s mission creep, but Obama said, “Faced with the…