I think what you'll find is if all the developed nations believe their very existence is at stake due to actions of the un-developed, it will result in war/the end of the threat very quickly.
Case in point: the fabricated idea that Iraq had chemical weapons that could hit western Europe. There wasn't a lot of debate on whether or not the western world was willing to eliminate the threat if it existed.
(note, I'm not trying to turn this into a discussion of the fabricated information, simply using it as an example that war is always on the table if a country feels its existence is in danger).