Putting aside the legitimacy of US imposed regime change, I'd say Americans living on the West Coast, especially in high value targets like SFBA, Silicon Valley, and Los Angeles metro, are more concerned about DPRK nuclear weapons and long-range ballistic development than folks living in, um, let me pick a random city..., Houston. So yes, the nukes are threats, and Kim Jun-un shouldn't be allowed to develop long-range ballistic missiles. I know it's selfish, but the possibility of being vaporized makes the whole thing much more real for those of us living on the Left Coast.