I don't agree with the whole, "it's just sound waves vibrating your eardrums, man," school of thought. Societies have taboos, big ones and small ones. "Swear words" are offensive to some because of their connotations. For example, "F***" and "intercourse" describe, literally speaking, the same act, but they are hardly interchangeable on any practical level. I'll try to make this convincing: Is there any phrase or sentence, anything I could tell you verbally, that would be offensive? Surely most of us would be offended by something. If we applied the meaning of that phrase or sentence to a single word, complete with connotation, the result could be referred to as a swear word. And it is very reasonable to be offended by words like that. The "F" word describes not mere intercourse, but only disgusting and distasteful intercourse. Nothing superstitious about that. Just my opinion, please don't be mad. heh.
That said, I think that cussing within reason is fair game unless otherwise noted in M rated video-games.