The Plot Made No Sense
David was supposed to be on the run from the military as well as had lots of money. Why show up at this family's house and pretend to be their dead son's Army pal when he could have just jogged a few more miles into Mexico? It made no sense. If he was so smart and wanted to lay low, he certainly didn't behave that way.
What are they doing? Why do they come here?
Some kind of instinct, memory, what they used to do.