In order for this to be the case it means that Kate McCann staged an abduction almost immediately she discovered her child missing, that she put more thought into covering her own arse* than in looking for her daughter, who as far as she knew could have been wandering around moments from the Apartment. This means that in your scenario Kate McCann is a most evil woman, and that Gerry is either evil too for supporting her in the lie, or has been duped by his wife for the last nearly 8 years. Is this what you believe Angelo?
* (though quite how that would work I'm not entirely sure as whether Madeleine was taken or left by her own design it happened when the McCanns were not there)
I don't see it that way at all. Any parent given the circumstances would jump to the same conclusion that someone had abducted her. Unfortunately or fortunately, depending on your point of view, the evidence does NOT support an abduction.
In fact, contrary to what you posted, there was no need for any lie. Mistaken would be a more appropriate qualification.
In the final analysis, it was the guilt of having left her unattended and the possible legal consequences of having done so which concerned the tapas group more than anything else. Thus we have the ass covering exercise in perfect parenting!