| Topic bans, ala RPG.net.
"Hi (Poster X), we understand you're a big fan of (subject Y), but we've noticed you've been posting some inflammatory stuff about (subject Z). For the next (day/week/month), please do not post about (subject Z).
Thanks!"
Another aspect is that the most vitrilic threads tend to be "about the industry" you could shift them to a subforum (but I don't think that is the best plan) - perhaps you could topic-ban some posters from the industry threads?
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