Trump insults political opponents and national heroes alike with middle-school taunts. He demonstrates no capacity for empathy or remorse. He misuses his office to punish opponents, as when he recently called for a boycott of AT&T to get even with his least favorite media outlet, CNN. He tears down institutions, once airily suggesting the U.S. should try having a leader for life as China now allows. He seems incapable of learning a lesson, telling an ABC interviewer last week — just two months after Robert Mueller’s report on election interference was released — that he would accept dirt on an opponent from Russia or China.