A travesty of justice occurred on Friday. A deserter with blood on his heels will walk free, leaving dead and maimed Americans in his wake, because of a bully’s pulpit and a weak man’s bench and gavel. The miscarriage results from a president who tweets too much and a judge who discerns too little. Candidate Trump tweeted some harsh things about the consequences he believed deserter Bowe Bergdahl should face. Among other things, Trump called Bergdahl a “dirty rotten traitor” and a “no good traitor who should have been executed.” Commentators expressed concern at the time about inappropriate command influence...