Well, on the bright side, they've probably killed more of their own people through allocating resources to such a thing instead of food and whatnot than they'll ever manage to take out with the weapon.
Plus, I'm not sure to what degree actual starvation is currently a problem in North Korea. It's probably more about e.g. health care not being modern?
No, it's not about just about health care. They literally have massive food shortages, particularly outside Pyongyang.
It's also little to no consolation that the Kims regularly purge the military ruling classes as well, while the people starve.