well sending 100 nukes to cover many areas of the uk, stopping any of them is better than nothing.. you would save a lot of lives.
secondly there is already developed missle defense systems that are extremely effective, laser beams that shoot missles and using missles aswell that intercept... stopping an ICBM is not that hard at all.. stopping 500 at the same time is hard, thats what i think money should be spent on.
and i recon stoping a single nuke is better than not, spared civilians who can now fight in the war!
edit: you havent considered people like me, even if i knew i couldnt win the war, i would nuke the enemy city, even if i knew they would inflict 10x more damage. just to see the world in flames! Missle defense is required, the americans spend like 8.3 billion $ on missle defense, which is biggest single project.
check this out..
http://en.wikipedia.org/wiki/National_missile_defense
way to debate,
i could kill you now, well that make it easier?