Korea War part 2 coming up?

The North Korean government is spending an incredibly large percentage of the entire countries output on the military. Upwards of 40% of the GDP. To put that into perspective, if the US Government spent that much on its military, the yearly budget for the Defense Department would be $4 Trillion a year. Yes, that is trillion with a T.

North Korea knows it cannot win a war against the US and South Korea if it is fought on conventional rules. But if they are able to make the refinements to their nuclear weapons so they can be fitted onto their missiles, then suddenly the North can threaten to attack Japan with nuclear weapons if they get involved (by letting the US use its bases) in a Korea conflict. Their missiles also have the range to hit Hawaii, Taiwan and much of South East Asia. Suddenly there are lots of people who are at risk if war breaks out. North Korea is also working on a sea launched missile which could then hit the US west coast mainland.

We can counter with our own nukes, but then we still lose. Is the US and the rest of Asia willing to risk nuclear war to defend South Korea? Is South Korea willing to risk nuclear war to stay free or will they decide to just fold and surrender to the North?

The need for missile defense is more urgent then ever. Otherwise our next president will face some very unpleasant choices. Abandon South Korea or risk nuclear war in Asia and possibly Hawaii and the Western US.

This isn't an academic choice for me as I live in Los Angeles and would be the target of any NK missile.