I think - please correct me if I have this wrong! - that competitors are not allowed to wear their hearing aid(s) during events, as they think they are too much of an advantage ... but how else will they know if a competitor IS deaf?!
I have to say that when it was announced that South Park was going to be on television in Britain and then one newspaper mentioned its "violence", I decided not to watch it. In all honesty, I don't think I have missed very much. In any case, I prefer factual matters to fiction.