That assumes that you believe that the world would be a safer place if only one nation had nuclear weapons. I would imagine that would be the least safe of all possible scenarios.
If everyone has nuclear weapons at least there is the possibility they will never be used. If they are used it basically ensures the end of the world so, swings and roundabouts.
To be fair, mutually assured destruction likely will end war but maybe not in the way we hope.
To be fair, it has been holding off nuclear war since 1949.
That assumes that you believe that the world would be a safer place if only one nation had nuclear weapons. I would imagine that would be the least safe of all possible scenarios.
If everyone has nuclear weapons at least there is the possibility they will never be used. If they are used it basically ensures the end of the world so, swings and roundabouts.