I think they serve a purpose as Outlaw said, but the thing I don't want to see is threads topping the latest and hottest lists with titles like "Jehovah God Exists" or the like. It's sneaky proselytising and I worry that it could kick off cognitive dissonance in someone trying to escape.
I don't have a solution mind you, unless Simon fancies policing every thread and changing the titles of Pro JW threads and I wouldn't wish that task on a broke dick dog.