Right, and I think you've zeroed in on what I feel is the most important point here. Somehow, for a lot of people, "diversity of opinions" and "angry posts subject to moderation" are more or less the same thing. For me, those are distinct things, and don't think diversity of opinions, at least not on things of interest to me (philosophy, astronomy etc) are under the crosshairs. Of course I feel that way because I feel like I'm right about something, and that something is the idea that diversity of opinion has a lot more to it than whether something is or isn't moderated.