I’m sympathetic to your position here, but I do think it’s worth noting that creating what you could term “positivity only” threads tends to create the impression that you are putting a thumb on the scale in favor of CoG’s buisness interests over open discourse. I assume the reverse (a hate thread targetted at an author with no positivity allowed) rightly would be prohibited.
I don’t think any of the mods here have bad intentions at all, and I totally see where they are coming from.
I think that when you are both the biggest publisher and biggest forum for discussing a genre, you incur a (difficult and unfair, but real!) obligation to go above and beyond to be seen as neutral, and not trying to skew discourse.
Edit: Mary reposted another comment of mine addressing the same issue in more detail, sorry for the redundency, it wasnt posted when I was writing this.