The U.S. Ambassador to South Korea, Alexander Vershbow, has paid a very public visit to the Kaesong Industrial Park, and the initial signs are good. Vershbow, a man who seeks the public debate his predecessors so often avoided, has not shied from stating some rather blunt views about North Korea. Thus, the fact that the North Koreans allowed his visit to go forward at all is surprising. Best of all, Vershbow snooped around, took pictures, and even seems to have...