it also helps in safety planning.
as I understand the scene, JP rolled into the driveway with no lights and engine off. Molly heard him anyway and started barking, waking JC. JC walks to parents' bedroom and wakes them. JP is walking up the driveway/sidewalk. James goes down to the door to look outside.
now, with what happened to the Closses, we can learn that in this scenario it might be best to run out the backdoor to the neighbors and call police and not to even give any attention to the front door. not many people would immediately run out the back of the house in this situation, but now we might decide that should be part of our safety plan and we can discuss this plan with our kids.