Jus post bellum justice provides us with two criteria: holding aggressors responsible (punishment) and providing some form of restoration to victims (restitution). The reality of our time suggests a very limited justice.
There may be no prudent responses against North Korea’s regime for Otto Warmbier’s murder. But such a concession to realism over justice does not invalidate the morality of the retributive instinct. It remains. And it remains deeply Christian.