They are not a credible threat to the world.
I admire your optimism!
NK is a destabilising influence in that part of the world and the danger lies in its noisy leadership prompting some form of strategic miscalculation, regardless of how reliable its nuke delivery system may be. And if the miscalculation is prompted in the tiny mind of 'King Comb-over while he fiddles with his enormous nuclear button in the comfort of his Mar-a-Lago castle, the effects of that are likely to be felt beyond NK. I am not suggesting there will be a nuclear exchange (or even a one-way gifting), just pointing out that even small intemperate actions can have unpredictable consequences, hence the concept of 'the strategic corporal' changing the direction of a campaign through an in-disciplined tactical action. State-level instability is never a good thing.