Challenged or Banned

Again, I want to say that I understand as a parent or guardian making a decision that a book is not appropriate for your child.  Personally I lean more toward the let them read it with you and discuss it approach, but no one's waking me up with nightmares, so easy for me to say.  I am somewhat confused at the idea that a book should not be able to any child, or even adult who might make use of that library.  Sure, not every book should be in every kindergarten classroom.  But that is typically not what we are discussing. 
So, with that, I am going to poke a little fun at some of last year's challenges. 
P.C. and Kristin Cast's Betrayed was challenged for causing kids to think of sex.  Because without this book, they would not ever do that. 
A number of books on the list were challenged for nudity which never ceases to amuse me, because these are not graphic novels or picture books but words.  So, apparently the concern is not that a child would be exposed to naked people, the child would be exposed to words about people.  (Who might be naked.) 
I suppose that should make me feel marginally better that The Awakening by Kate Chopin was challenged because the cover had a painting of a topless woman.  Sadly it does not.