I want to plug Making Light where you miss half the fun if you skip the comments. Teresa often manages to write these snappy summations of the human condition with the professional editing skill of, er, a professional editor.
Real people arent one-dimensional, and vice-versa. If you form a community around some shared interest, sooner or later someone in it is going to get Born Again and start preaching Jesus—unless its a born-again group to start with, in which case someone will begin selling Amway, or get into BDSM. Its one of those things human beings do.
This particular instance arose from the current hubbub on otherkin.