Another vote for no add here.
Pointless for U movies, if needed to be shown probably for 15 upwards. The Madeleine issue is a message for the adults not the children anyway.
Although some mums may scare their children off to avoid them running away in supermarkets, not to go into isolated areas, talk to strangers, etc. the only message here for a child is that even when they are sleeping they are in danger. Which would be, obviously, an exageration.