Yeah, that is a very valid question indeed. Although I think Arf already answers it in the note:
Except not asking them to reveal anything they can't.
Be on the forums, respond to grievances and issues people are having. Give advice.
Hell, why doesn't one of the CMs pop into threads where people are having trouble with how things work and explain them how it should work. And if it appears there are issues, point them to the issue tracker.
Or hell, be a gent and raise the issue on their behalf, provide the link, and ask them to contribute any additional info like screenshots or logs or whatever.
There are a lot of things CMs could be doing on the forums and elsewhere that would show the community they are there, that they are listening, that they are trying to help and communicate.
And i'm not blaming the CMs themselves. I totally believe Arf when he says they are excited to talk about things. I get the impression they have gag orders from upper management, because FD are deathly scared they might say something wrong. FD need more trust in their CMs to do their job.