I'm for banning them.
But what do we do to countries who violate the ban?
The UN has already demonstrated that it has no teeth when it comes to enforcing things like this...
So we are doomed to a future where nuclear weapons are more and more common.
That's probably ok, since as you stated, MAD was always just a bluff: If there is a nuclear war it will probably be fought in the 3rd world and will be more contained than the world destroying doomsday model on which MAD was based.