They're gonna nuke Japan? Come on. Do something original.
As wrong, wrong, wrong as your comment was, you raise an interesting point. Imagine if, at some point in the future, two American cities had been nuked, and some lunatic dictator threatened to do so again.
It would be like the Ayallatollahs of Iran telling us, 'We're going to hijack some planes, and crash them into your skyscrapers'. We'd take it a lot more seriously, because it would be not only a threat of violence, but a cultural insult.