As with all deterrent debates, the result for both sides will invariably be a score draw. Undoubtedly the World would be a better place without nukes....however, as soon as just one member has them, the rest are disadvantaged and open to coercion. Almost a bit like Germans and sunbeds - you might hate them for doing it but if you don't get your towel down you don't get your lounger of choice. Or, as Harry Enfield so eloquently put it, "Better to be on the train pi$$ing onto the platform than running along the platform trying to pi$$ in."
Good! That's solved the deterrent debate then - drunk germans on their hols and weeing off trains!