Originally posted by Dead Man Flying
Think geopolitically. The UN provides legitimacy to global decisions and gives the United States another tool to protect or otherwise provide support for other nations that share its world view.
If the United States leaves the UN, what happens to Israel? What happens to Middle East dynamics?
Also, the UN appears to act as a protector of the international status quo. While we may dislike it because it inhibits our ability to engage in actions that strongly disrupt the status quo, it also serves as a useful device for maintaining relationships and policies that benefit us.
-- Todd/Leviathn
To sum it up...keep your friends close and your enemies closer.