I'm guessing it's because of the "you shouldn't swear at other users" part?
Because I sorta doubt the staff here would go out of their way to censor posts otherwise. But if you're being a jerk to someone and swearing at them, then... maybe?
EDIT: OK, looking through your posts some more, it does look like some people have needlessly censored some things. I'm not sure why, as you've said, there's a filter for a reason. However, I would suggest that if you're complaining about mods censoring your posts, then swearing at them about it isn't a good idea.