There are many imperfections in the nation’s criminal justice system. So many, it’s hard to know where to start. Take your pick: The public defender system; death row; life without parole or the whole idea of housing convicts together in hopes of rehabilitating them. Poke around a bit. You’ll find some disturbing problems. None, however, will shake you to the core like seeing a child doing hard time behind bars, serving a sentence twice as long as he is old.