For Donald Trump, the confrontations are the point. In his first week back in the Oval Office, Trump has quickly torn up his predecessor’s alliance-driven foreign policy in favor of an even more rambunctious 2.0 version of “America First.” His provocations have raised tensions with key allies on multiple continents — and set up showdowns with other leaders that, at least politically, Trump will win regardless of how they respond. That was true of this weekend’s skirmish with Colombia, in...