North Korea cannot reach California yet. The real danger of a North Korean nuclear attack is on Seoul or Tokyo. Keep in mind that this would be a desperate act most likely provoked by a domestic rise in civil unrest. If there is a fear that control will be lost, then an external enemy is needed to retain power. We should be more concerned about internal events right now. As long as his power is not threatened internally, then such an attack would not make sense. He does not have an arsenal of weapon to keep up a war. Beware of internal events – they are often the issue the drives madmen to act in desperation.