South Koreans elected a new president Tuesday: Moon Jae-in of the opposition Minjoo party, who supports engagement and trade with North Korea’s Kim regime. His supporters celebrate him as the “peace” candidate, but Mr. Moon’s policies represent little more than accommodation of an evil regime that enslaves its own people.

Kim Jong Un’s dictatorship deprives its citizens of food, medical care and electricity; starves and works them to death in labor camps; and sentences them to public executions for crimes as benign as listening...