Promoting Fear by using the North Koreans

So why should the world be scared of North Koreans or Iranians having nukes when we allow the most dangerous and corrupt country on the planet have thousands of them. Is it that oblivious to the general public that the North Korean's are only building these weapons to protect themselves? Do people not think that the North Korean's would know that if they fire off even 1 missile, the world will respond by sending them back to the stone age?

Since the public are enriched in knowing the latest details of the threat against the West, did anyone read the article where the U.S just finished building a $6 billion dollar warship named "G.W.Bush?" As their educational and healthcare systems are in ruins, they always find money to promote war against the world.