Plot: In the aftermath of the recent elementary school shooting in Connecticut that authorities say left at least 20 children, six adults and the gunman dead, many questions remain: Could this tragedy have been prevented, and how can we keep it from happening again? And, how can the families of the victims and the young children who witnessed the shooting cope with such a trauma? Dr. Phil goes behind the headlines in the shooting and offers advice to families who might be struggling to talk to their children about such a senseless act of violence