Had my little one been on holiday with , or in the care of anyone even if I just went shopping, and then went missing I would have an extremely difficult time not wanting to murder that person for not keeping a permanent watch like I hope I do.
However, I have the luck of not being in that situation and therefore of having a perspective. I don't blame people who have children stolen from under their noses, and nor do I blame Madeleine's parents for having their daughter stolen from them from what they assumed was a safe environment.
Stupid in case of fire or sudden illness, yes. Stupid in case of sudden abduction, no.
My point was purely that people who will find a way of stealing a child are the people who should be villified not the parents. Yes, we know there are risks if you should ever leave your child unattended. No, I personally wouldn't ever do so (I spent my holiday nights on the balcony of my apartment facing the front door, for e.g.) but people can still get their kids abducted all the same.
There are nasty evil little people out there, but you sometimes forget they exist. It is still the fault of the abductors that they are evil enough to steal a child, and not the fault of the parents that someone was evil enough to steal their child.