I would change the rules to go something like this: Write a one sentence summary of your conclusion first, in as shocking terms as possible. Get people to vote up or down based on whether they agree with the initial one sentence summary. Then you justify the one sentence summary in subsequent paragraphs, which might cause folks to change their mind. That way we could get novel but possibly true beliefs in addition to irrational beliefs at the top.

Or rethink the game entirely along these lines so it is the "More Plausible Than I Initially Thought Game", so we don't get things like UFOs at the top. Participants upvote those comments that cause the maximum change to their beliefs, especially by making something surprising seem at least vaguely plausible. I dislike the current game rules somewhat because it seems like a signaling fest.