They haven’t done that. So what is their motivation to have them, offensive or defensive?
I don’t see any motivation for them to have them whatsoever.
“North” Korea is an artificial construct created by a war over ideologies that is well in the past. It continues to separate families and drive half of the Korean people into utter poverty.
It’s time is over, and if they are now sabre-rattling WITH a delivery mechanism that can attack allies, then the regime needs to end. I really don’t care how. I’d prefer to starve them out, but the decades when that was possible (Obama early, Bush, Clinton) are now over.
This is not a matter of imposing on another legitimate nation’s national sovereignty, like most of the US military misadventures are. No regime is legitimate when it needs a wall to keep its people in and separates families.