Much like when the school teacher would walk out of the classroom, we continued to behave ourselves because Sir may still be lurking outside the door. If on the other hand it was clear that the schoolteacher was definately out of range, all hell would break loose. I'm still interested in hearing the experience of others on this though. To start another list, you need the list of addresses. But a chat on the phone might make all things possible.
Retroactive moderation is moderation after the fact.
I don't read and approve posts before they are distributed. I do have speak with folks who post inappropriate material. The list is not unrestricted. I have rules. I depend self control of the subscribers with occasional intervention by the admin to maintain civility.