There has been much speculation, as to what DW's motivation was, for this crime. We don't know, and we may never know. IMO, this crime was personal...filled with so much rage and hate. He wanted them to suffer. I'm not sure what I believe, but the more I ponder, I have to wonder if the primary reason for the crime was torture/murder, and the robbery was just the icing on his cake. The fact that VF was still alive/breathing, when the first responders arrived on the scene, makes me wonder if her torture was somewhat less than the others. If DW hated SS, it might explain why he was so brutal toward the family. Was he less than so, with VF, because she was just a victim of circumstance, and not a part of the family? This is just something that has been on my mind.....