I'm sorry, but this is just blame-shifting. The problem "reverses" the minute a majority of parents decides to grow up. They can turn of the TV, refuse to buy the CD's, not patronize the films, not buy the trashy clothes ... and until they do, they are much more responsible for their children's corruption than any "entertainer."
It's easy to badmouth Madonna - and no reason not to - but what about real life? What about when your daughter wants to wear the navel-baring shirts? Or your sons want to see the push-the-limit movies or the Britney Spears video? Or your neighbor is wearing shorts that say "JUICY" on the butt? Are you going to be as honest with someone who can hear you?