Why would North Korea want to nuke the west?

We've had them under our gun for too long.

when you bully someone long enough don't be surprise when they loose it!

Because they are controlled by the CIA, designed to make noise whenever they need to distract from something.

They don't. It's our propaganda. He just doesn't want to look weak. He will return to talks, guaranteed. He's not suicidal, just has to keep up the appearance of strength.

It's ego. Nothing else. Kim wants to give the impression to his own people that the poverty stricken hellhole he presides over is as powerful as any other country. It takes a huge self love to even want to be a mation's leader, so the clashes between the biggest egos on Earth like Kim, Trump, Putin et al, are pretty much inevitable. Sprinkle in conflicting ideologies and you have a recipe for war.