The parents didn't even represent the realisation of the fact, they trusted that everything would go well, as it had gone on the previous evenings, thus not equating, nor was it demanded from them, the possibility of the occurrence of an abduction of any of the children that were in their respective apartments.
Reinforcing what was said is also the fact that despite leaving their daughter alone with her siblings in the apartment during more or less dilated moments, it is certain that in any case they checked on them. Without any pretension or compensatory effect, we must also recognise that the parents already expiate a heavy penalty - the disappearance of Madeleine.
Concerning the other indicated crimes, they are no more than that and despite our perception that, due to its high degree of probability, the occurrence of a homicide cannot be discarded, such cannot be more than a mere supposition, due to the lack of sustaining elements in thefiles.
The non-involvement of the parents in any penally relevant activity seems to result from the objective circumstances of them not being inside the apartment when she disappeared, from the normal behaviour that they adopted until said disappearance and afterwards, as can be amply concluded from the witness statements, from the telephone communications analysis and also from the forensics' conclusions, namely the Reports from the FSS and from the National Institute for Legal Medicine.
To this can be added that, in reality, none of the indications that led to their constitution as arguidos was later confirmed or consolidated. If not, let us see: the information concerning a previous alert of the media before the polices was not confirmed, the traces that were marked by the dogs were not ratified in laboratory, and the initial indications from the above transcribed email, better clarified at a later date, ended up being revealed as innocuous.