I didn't chime in earlier, but I've just had a look at Ray's Theistic Evolution thread and it's bloody awful. He's tried to boot both posters who replied after their first replies and his posts are utter nonsense.
I know the argument is that the Showcase forum is unmoderated and that it's a padded cell for the unmoderatable, but many newcomers to the board have made the same mistake, namely that the "Showcase Forum" is a sort of elite place where really good debates take place. It's the name that does it.
Previously the name "Boot Camp" let people know what to expect when they went in there, especially lurkers and new members.
I know that you want to give the more "problematic" members a place where they can voice their opinions and can't scream censorship, but what's going on in Showcase really is beyond the pale.
I would suggest giving people a "heads up" when they enter showcase to read posts so that they don't think this represents the "creme de la creme" or change the name of the forum to something a bit more suitable. I could suggest some, but I'd probably be permanently banned.
The final suggestion I have is that posts in Showcase by Showcased members which would bring down the ire of Mods in any other forum have that noted by a Mod at the bottom of a post without any sanctions being imposed.
You might feel that these suggestions are unworkable and I appreciate that sometimes I have abberant ideas, especially when irritated. If so, forget I even spoke