Flamewar detector sounds like a bad solution IMO. Why not warning/banning system to handle comments? As long as the argument is factual, without fallacies (and not subject to Poe's law), I would be glad if we could keep the discussions open even if people have radically different views.

If you indeed insist on closing the comments on flamewar detection - good courtesy suggests keeping the comments open for public review.

As for the conspiracy folk, why not make a multiple account detector and ban such folk?