Correct. Without a nuclear arsenal North Korea is an extremely limited threat to anyone but South Korea. Even if we gave them ten years of complete noninterference and let them do whatever the fuck they want other than making nuclear missiles... hell, assume we gave them South Korea, if that was something we could do... they are never going to be able to field a force that would be able to do what the Nazis did. They cannot conquer anything off of their own landmass. They just don't have the troops or infrastructure for it. Even if they clapped a helmet on the head, rifle in the hand, and explosive collar around the neck of every single one of their citizens and tried to ship them somewhere to stage an invasion, they can't do jack shit but cause some chaos. Where would they try it? Japan? We'd have American troops deployed there in huge numbers so fast you'd think they announced free pussy at the soaplands. China? Even if the Norks weren't China's bitch, and even with the fact that most of China's military equipment is shitty knockoffs of our stuff that Bill Clinton sold them the plans to, the sheer number of Chinese military, and Chinese people, would mean the Koreans would be able to do fuckall without support or backup from someone else, and no one would give it specifically because they can't win.This is pretty fftopic: though, and I don't think it's really an issue when it comes to North Korea.
It was dangerous to appease the Nazis because they had an entire continent to spread out over and make use of, as well as the capability and forces to take over the infrastructure of conquered areas and make use of it. Even if what we were doing with North Korea was "appeasement", without reliably working intercontinental missiles and the capability to go nuclear they're like a step and a half up from harmless.