Every other page there is always someone that brings up the profanity filter like it's an excuse to curse, and doesn't realize it's just a client-only setting for you. So you don't accidentally run across profanity in the chat like if someone did it in a linkshell or shout Limsa. What you write is in the server logs is available for a GM to read verbatim.
Like I said, if you think it's normal behavior to type cursing out in this game, the burden is on you, and eventually you won't have an account anymore. Maybe you need to start replacing words in your dictionary, what you think is reasonable, doesn't mean it is.