Do the why's really matter?
I was thinking about this - I think people want to know if the world we live in is basically safe or not. For people living or visiting in Arizona, it's kind of important to know whether, if they drive around the suburbs of Phoenix in the early morning, they might just disappear like this couple appeared to do. And we want to know, how likely is it our electrical contractor going to murder us and bury our bodies near his house? So the questions about what they may have been involved with isn't to blame them, but it allows people to understand how to keep themselves safe from the same fate.