I kind of think that a separate forum for debate would not be enough. If you really want to look friendly to the newbies, then I think the debate section will have to be private to the regulars. Otherwise the newbies are still going to wander in and think we are mean and unfeeling.
I see the merit in that. Then again if all the 'real talk' is private, the casual browser won't see any serious discussion of the things that are more serious, maybe