If they've reached the point where they actually have to use nuclear weapons in a MAD scenario, that political leader in question has failed at doing their job

If they've reached the point where they actually have to use nuclear weapons in a MAD scenario, that political leader in question has failed at doing their job utterly, and completely irredeemably. It's a complete and utter betrayal of both their constituents, and the responsibility the world entrusted in them. Why preface this with an "if" like it is a hypothetical where we don't know what happened? It is history now and we know how it turned out. MAD worked, there was never a nuclear war or major conflict between superpowers. Political leaders didn't fail and have been redeemed. Their constituents weren't betrayed, and the world moves on.