"Contemporary fiction for teens is rife with explicit abuse, violence and depravity."
Contemporary? Oh? In the 4th of Baum's Oz books, Dorothy and the Wizard in Oz, the Wizard slices a man in half with a sword, forces others to step into rings of fire that badly burns them (never mind that they're vegetable people -- still people), fires a gun into attackers and hits one in the eye, and possibly burns down an entire civilization.
That was written over a century ago. Just sayin'. Today's stories are often more about real life -- which isn't a bad thing -- but there's been plenty of darkness in youth literature since the days of Brothers Grimm.