What if Madeleine, on hearing one of the twins wake up, tried to light the cooker to warm a bottle, as mummy does and as a result her nightclothes caught fire ? The first time the McCanns would even have been aware of it would have been when the flames had spread to the front of the apartment and they could be seen from the tapas, in all likelihood too late to save the children. 30 minutes is ample time for this to happen and 50 metres 'as the crow flies' is far enough away to be unable to respond quickly enough.
Did the McCanns never consider that an abductor was the least of the dangers faced by children when left alone ?
Faithlilly, there are a 1001 things that could go wrong, if a child is left alone.
The most obvious is that the child could wake up finding itself alone in the dark, and become terrified.
I have a horror of fire breaking out, and the child becoming trapped in the building.
My wife has fear of little fingers pushed into electrical sockets.
The McCanns made a mistake, and they paid for it. What I don't like is people defending the McCanns, by claiming that it is perfectly acceptable to leave your children unattended.