Here's an article from today's Houston Chronicle that is rather eerie in similiarities: A mother was arrested for leaving a 4 year old and one year old twins alone in an apartment while she went out drinking.
One of the LE authorities said, "Who would leave children that young alone?"
Answer is obvious, of course, the McCanns.
And again, this just underscores that the McCanns escaped consequences because of their education and social status.
http://www.chron.com/disp/story.mpl/front/6058546.html
I think, til the day Madeleine vanished most parents in the western world were happily unaware that the possibility that the children might get scared after waking up and finding themselves alone is one of the minor dangers if you leave sleeping children alone at home even for only half an hour.