Now here is an argument for why the UN is a good organization that we ought to keep in place (partial list again):
1) The United Nations promotes common norms and a society based on the rule of law throughout the world.
2) The United Nations has had major success at disease eradication and prevention throughout the world. In fact, we gained valuable intelligence on Bin Laden under the guise of a polio vaccination effort.
3) Common things such as worldwide postal service and other global shipping, international civil aviation, and global telecommunications are all made easier within the United Nations.
4) The Security Council gives a worldwide legitimacy to UN actions -- be it sanctions, use of force resolutions etc. This is important for building a broad coalition and spreading the cost burdens around to achieve our goals. Additionally, UN missions in various nations allow the burden to be eased on our own soldiers as well.
5) The Security Council, as it is, allows for major powers in the world to effectively be on the same page, and keep a dialogue going -- even in times of disagreement -- and even when they do not act in our interest persay, we are not prohibited from going around the UNSC, as seen in Kosovo, Iraq.
I can continue the list, or we can have a real back and forth if you really want. It is up to you.
