North Korea knows better than to initiate a war with the United States.
Kim Jong Un is the new fearless leader of the North Korean people, but you'd need to have the IQ of a sea slug to actually think that he's the one pulling the strings.
The real leaders of North Korea know that their country would be obliterated if the United States decided to nuke it. Mutually assured destruction worked with the USSR because each country had enough land that you could each nuke each other and still have cities left over for round two, not to mention a large enough arsenal to ensure complete destruction of their respective enemy.
North Korea would be trying to send babby's first nuke thousands of miles with the hope that they'll actually hit one of their targets. If the US responded with only a handful of nukes, there would be no more North Korea. That's not mutually assured destruction. It's just "assured destruction". RIP in pepperoni, glorious leader.
tl;dr:
Do it, North Korea. It'll mean less work for map makers.