I’m a fan of the Heritage Foundation’s Bruce Klingner, consider him a friend, and can’t remember the last time I disagreed with him about anything, but when he writes, using unusually strong language, that the U.S.-South Korea Free Trade Agreement won’t help North Korea, I continue to harbor doubts. First, North Korea has become adept at selling its products under false labels. Second, some South Koreans — including some who could end up governing South Korea after the 2013 elections...