in reply to Which topic is most controversial within the halls of our sanctimonious Monastery:

Perhaps this is too obvious, but where's "any two alternatives related to voting/XP"? (public vs secret; gain XP when downvoting vs lose XP when downvoting; must reply when downvoting vs need not reply when downvoting; unconditionally downvote all nodes related to XP vs don't downvote them; etc.) :-)