I don't understand the big deal behind showing a topless girl who hasn't gone in to puberty yet. They're physically very similar to a boy at that age. And even then, full nudity, neither girl nor boy, before puberty does not excite me or offend me. I think until that point we should view the child as the non-sexual creature they are.
All modern art seems to be controversial like this, though. When Stravinsky first performed "The Rite of Spring," in France (a musical piece about the deflowering of a virgin), riots ensued. And most of the time, innovative artists are mentally in places where the rest of society is not, and won't be for another generation or two (or three or four...). People will probably look back on this in 50-100 years, and think we're a bunch of prudes, just like we think the critics of Picasso or Dali were.