I suspect threads with excessively high churn (combination of up and down-votes) across the comments in the thread indicate dogmas colliding. The false-positive to watch out for would be people saying interesting things that go against the status quo.

Something like:

  comment is interesting if (score * 2 + 5 > number_of_votes)
  thread is interesting if (number_of_interesting_children * 2 > number_of_children)