Monday must have been painful for President Donald J. Trump. On the tenth anniversary of his escalator descent from the gaudy heights of Trump Tower, he was confined to a modest conference table, one amongst the G7, in a Kananaskis, Alberta room decorated in modest alpine themes, rather than late-Saddam gilded baubles. By evening he was gone, back to Washington to preside over the Israel-Iran war. Given that his G7 counterparts are perpetually on tenterhooks should he launch an eruption, his early leave-taking was likely unlamented.