Here’s an equivalent argument: we were told that it’s ridiculous to think that a stranger would be able to enter a premises and pick up a sleeping child without it waking and screaming the place down, but the Alesha McPhail case proves this is not such a ridiculous idea after all.
I don’t remember anyone saying it was impossible but even Madeleine’s gran thought it was highly unlikely that if taken out of her bed by a stranger that she wouldn’t scream the place down. Further it’s not entirely clear whether the young man who killed Alesha was a stranger to her.
So with reference to other cases it is clear that it is possible for a group of people, not especially close to each other, to hide a criminal act even when it may lead to the loss of their livelihood and freedom and it is also possible to remove a sleeping child from a bedroom without them screaming the place down.
What you believe is simply a matter of opinion.