Just an observation. I'm wondering if Mr. al-Hilli was running from something. The family left their home at a somewhat odd time of year, given that the girls would have been expected to attend school. Prior years camping photos indicate the family seemed to have a penchant for bicycling, yet no bikes are seen with the camper this year, nor on the car at the crime scene. Was he out scouting the countryside numerous times each day to see if there was a safe place he could run with his family if he became alarmed about their safety?
I think he was running from someting in england....did every thing catch up with him in France,
If was frightened then he was on the borders of switzerland and Italy.
Why take his family to a place where he felt he was in danger?
If in danger he could have taken them to several airports for a flight back to England.