The only way North Korea would use nukes is if they were attacked and backed into a corner, which won't happen. It just doesn't work the way you're describing.
Using conventional wisdom, you are correct.
But lately that's been going out the window. A major US city was shut down for 24 hours because a 19 year old was bleeding out in a boat.
I wouldn't put anything past any country at this point. If they're starving, and we are the cause, or if their leaders or military are just batshit crazy, they might abandon conventional logic and perhaps blow some shit up.