Because as long as most people in the west think it is fear that 70 nations attack one single country, those single nations need nuclear weapons to defend them self.
Those who dont have nuclear weapons will end up being controlled or attacked by USA(52 nations) and NATO until they control them.
So the question is really:
Why am i against that USA and NATO shall control this whole planet and every single nation on it?
I bet Libya, Afghanistan, Iraq, Syria, Yemen and many many other nations wish they had nuclear weapons a long time ago.
Its better to be bombarded with false propaganda like North Korea is,
then it is to be bombarded with real bombs..
(image source: i no longer remember, its a meme that have been all over facebook for a long time)