Under no certain terms am I agreeing with how North Korea is responding nor that they aren't a threat. But sometimes it may be wise to step back and figure out why the other guy is thinking the way he does. If fear is Kim Jong-un's rational perhaps he could be approached in a much different way then how we approached these other countries.
Again I'm not supporting North Korea's current stance but sometimes scared people shoot first if they feel threatened. Maybe.. just possibly.. a wiser path would be to approach N.K with diplomatic assurances rather then strong arm threats. Like any other animal in the world you'll get further with treats then threatening them with a stick.
Below are a few examples of past policies where we acted in haste where no one was better off for it and things could have turned out far differently.
So Here It Is In The Nutshell
We're against North Korea, Syria and Iran just as we were Iraq and Libya. The difference was Iraq and Libya were pushovers unlike Syria (with Russia's support), Iran and North Korea with their missiles and nukes. I'm not talking about right or wrong policy or ideologies. What I'm trying to point out some of these nations aren't coming to a gunfight with a knife. Something which is probability not escaping Kim Jong-un's attention. We need to address this with his and other countries. How?
As long as they see us as a threat these issues will never be resolved. Indeed Iran is a threat to Israel and others in the middle east. Syria not as much (they have their own internal struggles). None of these are a direct threat to the United States so long as we don't attack them. So how about this... we play more a role as peacemakers rather then storm troopers in their disagreements with other nations. We have a bad habit of making every other country's problems our own. Nothing wrong with helping out a friend, but we've gone beyond trying to interfere in their own internal problems.
I'll give you other examples where we're sticking our nose in.. Cuba, Venezuela, the Philippines and Somalia each posing little or no threat to our national security. No one appointed us guardians of the world. Sometimes these things have to work themselves out within their countries. Nothing wrong with offering counseling and advice, but I don't see how pointing a gun or nuke at any of them is going to turn out well for anyone.
Just like in personal situations sometimes it's better to avoid getting involved in arguments. Ever try to break up a fight?