Maybe we just need to think creatively here.  With a bit of
rule-tweaking something like Spam Assassin could be modified for use as
a bile filter (look for phrases like "I am 100% correct" and "Are you a
_____?").

     Posts that have too much bile could be run through the Swedish Chef
filter before being sent to the list.

     It wouldn't solve the problem, but it might change it into
something that wasn't so much like deja vue all over again.

    -- Markus