In the interest of transparency, I feel the need to announce that I have permanently banned mahagonny's account. I don't want to make a practice of announcing such things--it doesn't seem appropriate, in general--but at this point, their persistent bad behaviour on this board was just too much, and was clearly affecting too many other members.
We have a very open moderation policy here, and that actually makes it pretty hard to moderate effectively, since I'm constantly having to err against my better judgement. But at this point, policing mahagonny's contributions just wasn't feasible any more (especially for just me), and it's not like doing so over the last few months has helped much at all. Their continued participation here made our forum a distinctly unfriendly (even hateful) place, and their contributions to the discussion here amounted to little more than either offhand hate directed towards their groupe du jour, or a monomaniacal focus on Black people. I judged that enough was enough.
If you want to advocate for them, you may certainly do so (via PM, please), but at this point, I need to be given solid reasons to believe that mahagonny's continued presence here won't continue to be deleterious to the community. If you think I've overstepped myself, that's fine too, and you're welcome to say so as publicly or privately as you like.
As far as I'm concerned, no other bans are imminent. Nobody else's behaviour is a patch on mahagonny's.