As regards Korea, the calculus is a bit different. It’s not that the folks in the South couldn’t bear open warfare with the North. Although there some significant factions that oppose any sort of military action against the North, that opposition wouldn’t amount to enough to stop a serious military campaign. The problem with the Koreas is what happens after the South wins? There is a lot of conjecture that the financial consequences of such a reunification would make the German reunification look like a cakewalk. Winning a war against the North could possibly be the worst possible outcome for the South.