I'm not going to worry about splitting hairs on this. Obviously the UN and US are not analogous in their structure or purpose, so why bother on defining precisely why.
I was just circling back on this thread because I actually enjoyed this discussion. Sure, I may have been a bit of any asshole here and there, but in my defense, you are wrong and I am right. It took a bit to figure out why I was enjoying the discussion; I think I figured it out.
It's because it doesn't really matter. So many of the discussions over the last four years have centered around cruelty to immigrants, or the age of misinformation, or Trump's treating the US government as his personal property to further his power, etc. So many of the discussions over the last 8 months have centered around assholes ignoring science and medicine, in the face of a global pandemic, which is likely to kill a half a million Americans. It just feels really nice to focus on a discussion that just doesn't matter, and doesn't really have any major ethical or moral implications for the people arguing it. I don't think you're morally deficient for believing the current system make sense. I just think you're wrong. 'cuz you are.