I believe that there is a fundamental difference between cursing and cursing at somebody. The latter is what we do not need in any community as its only purpose is to serve as insult to accost another person. The former, however, is far more innocuous in its use. These are more typically used in outbursts of passion -- sometimes including anger -- but are not specifically directed with the pointed purpose of harming somebody else. It's a rated T game, that they're as worried about people offending one another with that rating is already seemingly pointless as they can't make the claim that it might "be found patently offensive." (in most cases)
I agree that swearing is a repugnant habit for most young people; specifically those with access to the internet. But that does not mean that they should be punished for using words in a non-defamatory sense, even if the punishment is exceedingly temporary. After all; self control is a self-taught habit, not one that can be forced upon you.