Lol... after reading this thread I love this forum even more. Actual intelligent discussion! Wow.
But really I think the OP has a point... but flat out censorship would be bad I think. Still I think that it is reasonable for people to try and restrain themselves from something that is largly unimportant, like cussing, if it makes another person uncomfortable. Really the power of the F word, for instance, is shown when someone who doesn't cuss says it. Then you KNOW something has pissed them off.
Further, while someone cussing a lot does not nessesarily prove that a person is unable to express themselves, I think it's reasonable to say that typically that is true. And while cussing does allow for a greater range of expression, it's particularly because cussing is taboo that you get the greater range of expression; that is the shock, offense, and rarity of the words is the cause of the greater range. Cussing all the time just ruins it.
As for people monitoring themselves - honestly I think it's reasonable to ask mature children and adults to try to not regularly offend people, regardless of whether children are listening or not. It's just part of society - civility is important. We can't control the internet, people, or whatever else, but we CAN control ourselves and we have to make the choice wether or not we are going to get along with people, even if they are more uptight than us. I mean, do we really want every day to be like watching some of those political commercials that come out?
On a side note, I love the filters. "Indoor sports activity" is particularly great 
Anyways, the idea that a filter of any kind makes it somehow "safe" is just silly. Everyone knows basicaly what was said; it can be figured out from the context. And kids are smarter than a lot of people give them credit for. Especially when they are curious.