|Sorry - could NOT resist...|
But what are the real-world options that America and the West actually HAVE in North Korea? When you consider that Kim Jong-un is a third-generation dynastic leader whose primary goal is to retain power and control of the population at any cost, you realize that nothing will change until the regime changes, but conditions are so brutal and there are so many different factions empowered by the military that if the regime did collapse (or were to be removed by external force) the waves of refugees flowing into South Korea, China and Russia would, along with the helpless North Koreans still trapped in a collapsing state without a functioning economy would represent one of the greatest human tragedies of the last century.
Once you are realistic about Kim's goals and intentions, you understand why he would consider a strategic nuclear deterrent so important. It is the thing that innoculates his regime against attack, virtually no matter what provocative actions he chooses to take. And once he has road-mobile solid fuel ICBMs with enough range to reach the US, that deterrent becomes impossible to ignore. North Korea's previous conventional deterrent was to hold Seoul at risk with thousands of artillery tubes just across the border, but while that has been effective, Americans, to be quite frank, are less concerned about a million Korean casualties than they are about one American casualty. Kim's generals always understood that they might have to actually execute on that threat, so they made a perfectly rational decision to move to a nuclear capability. They can now hold Seoul - along with other targets in South Korea and even Japan - at risk with short range nuclear missiles as well as the massed artillery already in place.
Any strike on North Korea runs a very high risk of turning into a horrific regional conflagration, with several cities wiped out and millions of Korean (and possibly Japanese and Chinese) refugees desperate for aid and shelter. It seems perfectly clear that no amount of classic American tough-guy posturing is going to convince the North Korean leadership to do anything but keep pushing the development of their strategic deterrent. They'd literally be crazy to do anything else.
At the end of any thoughtful analysis, the only possible answer is negotiation. If the west can offer North Korea enough benefits - and a credible promise not to attack - perhaps Kim can be convinced to give up his nukes. If he can't, a strategy of containment and a policy to live with a nuclear-armed North Korea is the only viable approach. And while the American military leadership will empahsize that this policy of containment would mean missile defense and a powerful military presence in South Korea, in reality - behind the bluster - it would mean accepting another member of the nuclear club and just trying really hard to prevent further proliferation.