i think some of it has to do with imo, heavy moderation of the forum. lets face it, this is a discussion forum. discussions where everyone is nice nice, ho ho jolly old chap (insert lots of smilies in order to avoid offending) makes coversation a bit timid.
This about sums it up in my opinion. Nothing to very little is gained in "discussions" where everyone has to agree or at least pretend to. I have been a member a long time and when someone posts something blatantly ignorant or mean I just tend to ignore it. I don't now, or ever did need the mods to police it out for me.