Who can say that we don't have an even more, ahem, explosive plan now?
Probably because nuking is pretty much the most explosive card in our deck. We used to keep nuclear subs with nukes off of the N. Korea coast. Every time the N. Koreans massed on the border, the subs would surface and make themselves obvious... Essentially waving at the N. Koreans saying.. "Hey, how much for that parking lot you call a country?"