Lydia Polgreen: It is unsettling how often Trump affects astonishing indifference, as though the most powerful man in the world were merely a spectator to events he himself has set in motion -- and who in any case has little investment in the outcome. But that curious passivity reveals a darker truth. Trump seems to believe that he, like his fantasy America, exists on a different plane, utterly untouchable by the swirl of global events.