Of course the McCanns have not been exonerated.
In order to be exonerated, it would first be necessary for them to be in a position from which exoneration is possible.
As far as I know, the McCanns have not been arrested, charged or convicted of anything at all. It is therefore not possible for them to be exonerated.
Now - that was easy, wasn't it.
Well, firstly, the fact that the McCanns have never been arrested, charged, or convicted of any crime presents a fallacy of presumption ... it presumes that, ergo, the McCanns
must be innocent and there is no other option to consider
In fact, we know, there are many guilty people who have never been 'arrested, charged, or convicted' for the crimes they commited
Additionally, the McCanns
are in a position where exoneration is necessary .... the investigation into the disappearance of their child was shelved with the possibility that she died as a result of neglectful homicide being left on the table by the Portuguese Prosecutor