Tough questions. I always liked the idea that the stock boards that are specific to a particular stock were open to everyone as long as they observed TOS. Personally, I'd like to see this unchanged.
However, it might help to provide private groups for people. So, for instance, you might get a "InfoEDIG" board that only allows certain posters and focuses on just factual articles or "LoveEDIG" for those wanting to exclude nay sayers.
One thing though, I feel that if someone is posting personal attacks on someone else, those posts should be deleted regardless of what kind of board they are posted on.
And back to the original idea of public stock board, I like to say that I've learned alot by being on iHub boards that have controversy and where lively discussions occur. It's actually kind of fun as long as it doesn't get out of hand. I think your system here has taught alot of people how to be better posters, how to get their ideas across, keep thier focus on the issue and avoid attacking individuals for their differing opinions.
Look at the RANTS board. It's gone through some hard times and had gotten out of control, but as of late people on all sides are making a better effort and things are improving IMO.
I know you like quotes... here's one for you...
Nothing ever gets settled in this town…. a seething debating society in which the debate never stops, in which people never give up, including me. And so that's the atmosphere in which you administer.
George P. Shultz