Good answer! I know of these progressives.
In a sense I have been there, done that. I went through the public school social studies drill when the UN was presented as the best thing since sliced bread. Nothing about how kooks could and did completely pull it out of kilter, of course. (At that time, IIRC, Che Guevara had already hooted his insanity into the UN several times.) There was just some blind faith that somehow, a democracy spread across the world will fix things just because people are that way.
Faith is not wrong! But it needs to be pointed to the right place! A solid God with solid goals and solid promises.