To pursue your line of thought:
I don't want my kids to see any more examples of filth and foul-mouthed language than they already see. Mushrooms are kept in the dark and fed manure. Since my kids AREN'T mushrooms, I don't want them to be fed any manure. They aren't in the dark, either; they know there's plenty of evil out there, and they know (usually) that the less of it they experience while they are young, the better off they will be, and the better they will be able to deal with it when they run into it.
During the rebellious years (13-16 or so), every time they see profanity accepted makes it that much more likely that they will internalize and accept it. Once they're past the rebellion stage (16-18, depending), they can see crap like this and recognize it for the ugliness that it is.
Too bad you can't comprehend this.