What's the point of having a Mechaman and silencing him? Let the man have his word, obscene as it may be!
I'm not a huge fan of the world filter either, but it serves a purpose. This site isn't just a forum, it's a library of information. Students won't be able to take advantage of the data on here if their school or university blocks sites that contain expletives, and teachers won't be able to use it in the classroom.
(And teachers
do use this site. Funny story: last year I walked into my Social Studies class early and an election map on this site was on the projector screen.)