I posted this comment some time back too about the flawed nature of JW reasoning.
If we came across a person on the street who has been hit by a car and is badly injured, disoriented and in pain, would we walk up to them and say "it is your legal right to call the ambulance if you wish - I wont prevent you from doing so". Then walk away?
No two witnesses existed to that incident...so we "cant get involved"...
Or, if we learned that someone committed murder, would we call Bethel to ask the Service dept how to proceed? Or would we just call the police and leave it in their hands? What is the difference with the crime of child abuse?