The UN is big, just like a big megacorp, different groups are different. A few of them could take up the initiative.

Ignoring that those orgs will probably have high ranks if you asked a random sample of people about trust, what's the actual difference between them and anyone else?

As long as you are using tls and avoiding packet injection there's little difference. I'm sure plenty of governments own exit nodes themselves. Good on them for contributing to the network.