Kids can't have fun without a singer who spews pornographic lyrics? What will they do without Kid Rock???? A good time without him is now impossible to be had! The party is ruined. /sarcasm/
How do you know that he would've included that type of content in his show?
So one must be forever JUDGED by his past actions?
We're talking about teens here...late teens and "young adults". A few "naughty words" wouldn't kill them. They're not 8-year olds, they've heard them all before (Believe it!), and a few will most certainly go on to join the military, where they will CERTAINLY hear them all, and worse. Daily.
(Don't get me wrong..I sincerely doubt that, had KR appeared at the event, he'd have used any such language)
Your coment has been tried before, and the kids, who are the ones who determine what's "fun" for them, will usually decide for the more "edgy" performer. Sorry, they don't tend to like the "sanitized", cookie-cutter music that SOMEONE ELSE prefers.
So, the short answer to your question is, "Not as much". Why should THEY bow to YOUR opinions on the matter?