Every time someone brings up "wants to wipe out xyz", I wonder how that would play out. North Korea wants to nuke the US and SK, Iran wants to nuke Israel, Pakistan wants to nuke India, etc.
But playing the scenario in your head leaves to a simple conclusion: If either NK or Iran would deploy nukes, it would be their end. It is likely that the US will remain the only nation on this planet who dropped nukes on civilians.