I don't think that anyone seriously fears that the world can be blown to pieces all together. But what one can fear and rightly so are regional things, like in the Middle East, India, Pakistan, the Korean Peninsula, borders in Africa, etc. ↗
Some day, somebody is going to have to start talking about what happens to us all a decade from now if we let these North Koreans and the Iranians go forward with their nuclear weapons program. ↗
The point is, once they have a missile that can hit the United States, we are now back in the kind of game we used to worry about with the Soviet Union, only the Soviet Union was more mature about this whole thing than I think the North Koreans will be. ↗
Proliferation of nuclear weapons to terrorist organisations is far more dangerous than proliferation of nuclear weapons to states, even states like North Korea. ↗