N. Korea Nuke Mega-threat

The usual question of an outsider to an insider like me is to ask "how's life in Japan?". The standard answer of the long time resident feeling that his duty is to deliver a list of pro and con often starts with the pro factor that is safety in everyday life, despite all recent tragic events one can scoop up from the news. But now, that micro safety is threatened by a potential event that is bigger than the micro area where daily life takes place, daily life never happening within large spaces. The threat is that of North Korea launching a missile rocket loaded with a nuclear bomb. In other words, and putting aside the technical capacity and tangibility of it all, the idea, crazy or not, that Tokyo could be the target of the mad and not so far neighbor nation is part of the plausible discourse one can deliver about Japan these days. Yes, daily safety is a fact, despite train accidents. But from now on, the threat of a major earthquake is no longer alone in the list of possible mega-threats, and despite the differences in causes, odds occurrence and consequences. What if North Korea nukes Tokyo?