... it's part of why every country on earth [...] has been very "No nukes! Not for any purpose!" all throughout until today. Like everyone understands it's doomsday shit.

Everyone except the arch-ghoul Kissinger and his merry band of war criminals. IIRC his initial political rise had to do with the book he wrote about "tactical" nukes. His thesis was something like, "ok, maybe big nukes are bad, but we can use little ones. As a treat".