N Korea's hostage 'playbook' backfires with Warmbier coma

North Korea has a well-thumbed playbook for detained American citizens who are valuable diplomatic bargaining chips for the regime, but the case of Otto Warmbier, flown home in a coma this week, is a glaring exception.The script is simple and familiar: arrest an American, hold a show trial ending with a lengthy jail term, release them in exchange for a high-profile visit -- Jimmy Carter and Bill Clinton have both helped free detainees in the past -- which is used for domestic propaganda."With Ot