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There already were "small nukes" and "bunker buster nukes". And no, the US apparently does not have enough weapons: they have no answer (yet) against many of the nuke-proof underground bunkers that every dictator seems to like so much. If you do not have anything that can destroy those, then you must design something that can. If "bunker buster nukes" are the only answer, I see no problem with the US making them. The US already has several bombs designed to destroy bunkers, but they're either not good enough, too inaccurate, or too unwieldy to use.
The point, as usual, is not to actually *use* them; it's the potential of using them that is the key factor. After all, normal nukes can destroy cities; but what about that nasty leader that knows he'll be safe in his underground lair... If enemies can no longer hide underground for fear of being destroyed there too, they're going to think twice about starting a fight.
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