We don't need swearing. It's just an added temptation if it's there and just continues down the path of a fallen web.
Really, we don't need it. It highly disrespectful and enitrely unneeded. It sets a poor example and makes you appear as classless. It gives a bad impression of yourself, and why would you want to do that? It reduces the respect people have of you, and studies back this up.
When a person curses, it can start to becomes a habit, and that isn't a good habit to have.
I know it's a "minor" thing to some people, but once people give in to the little things, it's much easier to give in to the larger things. We don't need it, keep it away. We've been fine without it. People have their ways of getting around it anyways.