I've never felt the need to take a side, I don't feel pressure to do so.
A lot of the time I can see a NBU in an AIBU post even if in general I think there is some U (or NU).
There are a few threads where I take a firm side one way or another but that is not due to pressure from the Forum.
Out of the whole of MN, it's this forum that I feel most happy and I am a natural fence sitter, I can often see both sides, I don't much think that unreasonable things are always unreasonable, and vice versa. Because that in itself is enough evidence that actually this is a good forum for discussion (and a forum can only ever be as balanced as it's users) I have to say YABU.
Yanbu. I also hate when people post stuff thats clearly not an aibu. Like 'aibu to ask your opinion on this wallpaper' or 'aibu to ask you what clothes you wear if your a fatty in the swimming pool' YES YABU. I come aibu for aibus:-D
UKparents (dating myself now) had a debate section which was lots like AIBU. The good thing was that all the debate went in there, people were very civilised discussing things in other topic areas. If you wanted polite discussion the last place you stuck it was in their Debate section.
Maybe an "Exploring Ideas" section? (?"Polite Discussion", "Sharing Ideas"?) So then it's implicit in the title that it's sharing & exploring, not about debate or YABUs.