Siegfried Hecker, director emeritus of the Los Alamos National Laboratory and the last known U.S. official to inspect North Korea's nuclear facilities, differed, asserting, "Overselling is particularly dangerous. Some like to depict Kim as being crazy -- a madman -- and that makes the public believe that the guy is undeterrable. He's not crazy and he's not suicidal. And he's not even unpredictable. The real threat is we're going to stumble into a nuclear war on the Korean Peninsula."