Never!
I was just thinking;
All this talk about Walmart; Most hunters in rural places that don't have a lot of options, would go to Walmart to get hunting supplies. If their home photos of the Peterson Rd home, were any indication, the Ws were good at one thing, and that was hunting.
Some of us talked about the murderers possibly being hunters. The Ws may have taken what they knew about hunting deer, boar, and turkey, and applied the patience, and scouting of their prey's habitat (stalking), and applied it to humans. They then just went to their usual hunting supply store, Walmart, to obtain what they needed for their hunt. Just because one can do one thing well, doesn't mean they are a candidate for Mensa.
I've not seen anything like this family before. Instead of the DP, maybe take that off the table if they'll allow criminologists to study them, and will agree to leave their brains to science.