Mr Obama is not a pacifist. He sees the utility of force in individual tricky situations. It would not be at all surprising if he uses a bit of it soon, in drone or aerial form, in Iraq. What he does not see is its strategic value. He does not grasp, apparently, that the Pax Americana, under whose protection we have lived since 1945, has existed because it has always been backed by the credible threat of force. Weakness is provocative to bad actors, and some of the world’s worst have now been provoked. This seems to have come as an almost complete surprise to the Obama White House. The Peace President is starting to leave a legacy of war.