What I find most interesting is that he thinks the UN is out to rule the world. Improve it, yes. End war, tyranny, oppression, yes. But rule it?
Also, he seems to think that the UN was established by leftover League of Nations folks. Well, the thing is, the UN was essentially established by the US, which notoriously did not join the League.
As far as I can tell, the UN and the Interstellar Alliance differ only in the military power at their disposal. Sheridan's IA might be less interventionist, but the spirit behind the two organizations is the same.