David S, I assume that what you wrote is a parody.
But if it is not, would you answer a question or two?
If country A has nuclear weapons and all others do not, country A does not have to fear invasion from other countries and can even demand protection money from them.
Is it then in the interest of country A to give those weapons up under those circumstances?
Would a nation like Iran, or North Korea, or Russia, or Uzbekistan, or Pakistan ever lie about its possession of weapons or cheat on an agreement about them?
Do you expect rulers of foreign nations to act against the best interest of their countries?

A likely outcome of your dream is the Most nations espouse our President’s cause with enthusiasm and glee, hoping that all other nations actually disarm, except of course themselves, who will merely hide their weapons or even speed up their rush to develop them.
Those few highly ethical regimes who actually honor their commitments do give up their weapons, leaving all such weapons in the hands of dishonest governments that lie and cheat.
Each one of these may become convinced that it is the only cheater, in which case it will feel free to start a nuclear war!

Of course in reality everyone but you and our president will laugh at his speech and ignore it entirely!

I am afraid that reforming the world and creating Eden on earth requires much more than gestures and dreams of glory. It requires reforming the ethics of mankind and in fact it requires reforming human nature in its entirety.

That our president’s gesture will do that is really quite a humorous conception. I am glad he made it for all the fun it is causing! But what happens when everyone treats him like a buffoon or a nitwit?

Did he have to say this before an international audience?

Taking off all his clothes and streaking around the UN would have been less embarrassing!