Sure. Once North Korea goes nuclear, they're no long just a South Korean problem.
It's not 1950. Global communism isn't poised to take over the world, and we have no interest in defending South Korea vital to the United States. While South Korea may be happy to bow down and accept the North's leadership, we are not. What South Korea wants is no longer the primary consideration, when dealing with North Korea.
The dark secret of WMDs is that once the know how and technology passes between enough hands, there's no way we'll be able to track it back to Pyongyang. If Libya got the bomb from Pakistan and used it on Algeria, would Pakistan be on the hook? How about China, who gave Pakistan the bomb? Of course not. Politics don't work like that. Weapons sold are just that. Weapons sold. The only people who are held accountable are those who use them.
Same goes for whoever the DPRK sells weapons technology to. WMD proliferation will destabilize the entire world, so it's in our interest to combat it, whether or not the locals support us.
" Same goes for whoever the DPRK sells weapons technology to. WMD proliferation will destabilize the entire world, so it's in our interest to combat it, whether or not the locals support us."
I think it is going to take offensive or terrorist use of a nuke against a major asian or western target for the political will to develop to begin absolutely brutal disarmament measures against any state attempting to develop nukes, by which time there may be several more nuclear powers of dubious integrity...
I cringe when I see/hear people say this. The communists are closer to their goals now then they have ever been before.