I think an area like this could benefit from some very thoughtful ground rules. Maybe take a look around at some other groups that are successful. Are there any?
It could be helpful to give some explanation of how rules work and why they do, eg how you cannot call Davey a jerk but can say his statement is dumb. There are still people today that do not realize the difference when moderators take action on one but not the other, and just assume bias. There needs to be civility.
There needs to be structure. Will it just be anything goes or could there be guidelines. Not exactly like debate guidelines but something of a similar nature? Something that keeps a topic from running in circles. I dunno this might take alot of work.