Is North Korea's Nuclear Program a bigger threat?

There has been a lot of news around the latest underground-nuclear-weapon testing done on last monday. This testing has created fresh concerns about the proliferation of nuclear weapons technology.

It is learnt that North Korea has been working on producing the weapons-grade level of plutonium since almost last 3 decades now. The testing is expected to be measured somewhere around 1.5 to 4 tons which is almost 10% strength of the bombs which were dropped on hiroshima and nagasaki during the second world war in 1945.

North Korea is believed to be working to develop a warhead small enough to fit on the tip of a long-range missile. Some experts say that North Korea has already created nuclear warheads for medium-range Nodong missiles that could strike South Korea and Japan.

Apart from this, what is the worst thing is that , if such advanced and catastrophic technology falls into the hands of some wrong people, it can cause a big disaster to the world and world peace. Now that most of the countries have been trying to develop their nuclear stock piles to scare the neighbouring countries, the race for this technology is growing.

But, the point here is to look at the RCA(Root Cause Analysis) as to why we such countries are going to upgrade themselves to nuclear warheads? Is it because of the sanctions on them or that they are fools and scared people? I dont think they are fools and scared, if they were, they would have not dared to challenge the world and do what they want. there cannot be a smoke without a little fire and similarly, its not just that all of sudden these countries want to develop their millitary. its a lot to do in the past and current oppressions as laid by some of the super-powers of the world. i can understand if the countries were involved in developing such technologies for solving the energy problems of their countries, but trying to develop just to power the millitary means that they do not trust their neighbours and their allies.

Why and what made them do to go against other major countries? this is something to be thought. but whats the use? almost every body knows what major reasons could be pertaining to those countries and neighbouring conflicts but yet cant do anything.
CATALYST countries who fuel such situations should be identified and kept away from the local conflicts. its good to be an arbitrator but not to side one country and neglect other.

Now the current worry is, if a small country like North Korea, opens up the nuclear war, then the impact would be a World War III and i dont think , we will ever have the World War IV in future as there would not be any world left out after such an advancement of the technology.