Yeah, they should just let you choose. I think Diablo II turned on a word filter after a while in chat rooms, and the game is rated M. Anyone playing it, legally-ish, is not gonna have a problem dropping a :skull::skull::skull::skull: here or there. But I guess it's nice to have the option. Forcing it on you, though, nah.
Although, on the other hand, I don't need to swear or anything either, so whatever I guess.