If a rational actor sees no way out but to use a nuke, then there is a much larger irrational actor that is tyrannizing the world and needs to be destroyed. And

If a rational actor sees no way out but to use a nuke, then there is a much larger irrational actor that is tyrannizing the world and needs to be destroyed. And since the actor is rational, it will have carefully considered the choice and have come to the conclusion that the loss of life was worth it, for an end of tyranny.