I never quite understood that argument about nuclear weapon. I mean, the simple fact that we find it so horrifying and yet still keep them around "just in case" because of their dissuasive power goes against the whole point.
You can't have a weapon you show to everyone and prevent them to get one as well because it could threaten other people, just like you're doing to prevent them building one. Hypocrisy at its finest.
Apparently, you are too young to remember the analogy of standing waste deep in gasoline with a fist full of matches. If using your match on your opponent means that you burn to death, then you are not going to light it. The term was "mutually assured destruction"
What you don't want is a lunatic showing up with his own matches. It's one thing for Russia, China, the US, etc. to have these matches, and another to give it to Iran and North Korea.
And disarming doesn't work, because as soon as one side thinks they could actually "win" a nuclear war, there is a chance that they would actually start one. But lunatics don't care if they can win, they are just insane, so we can't let them have them.
People complain about all the nukes, but how many launches have there been since WWII?