This post is utter fail. You shouldn't continue a mistake just because some one else might come along and try to make the same mistake. For Pete's sake, leave a note on the door : we tried, it won't work.
Leaky roof ? Rather, one shouldn't try to patch a leaky roof while the house is burning down - although hey, if any one wants to try, giver'.
Look, IMHO, short of some "global village" nonsense the liberals like, the UN, or an organization like the UN, is absolutely vital in maintaining international dialogue and some level of cooperation.
Eliminating the UN, or withdrawing from the same, would lead to a break down of communications across the globe.