> Perhaps Wikipedia should have allowed a kind of sub-Wikipedia: a sort of parallel wikipedia that deals in topics more akin to Urban Dictionary entries.

It's an interesting idea. I imagine a sort of "Official" and "Unofficial" modes. You could flip a switch and see the articles and edits that didn't pass muster.

That way, the ideas and info wouldn't be lost/censored, but wouldn't get to claim they're "formally accepted."