The UN has been a sacred cow for too damn long a healthy debate about if its actually doing what its supposed to be and if its effective would be nice. Complete withdraw is probably premature and unwise but I do think the UN should undergo some scrutiny from both US and abroad.
Except we have these conversations all the time (just not on Hubski). Depending on who you talk to, the UN runs the whole gamut from being well respected to being held in utter contempt. Furthermore, the UN does a lot of different shit. Some more effective than others. Wanna joke about non-binding resolutions? Most people will joke with you. Wanna tall shit about UNESCO or The World Food Program? Prepare yourself for a hearty debate, because those programs have some staunch defenders.