It wasn't me who brought up the subjects of evidence and proof, both of which lack an agreed definition. Obviously you've no intention of explaining your post so clearly it was an opinion being posted as fact.
In my opinion it's quite acceptable for police to see many indications leading towards a possible answer in a case. In the end the PJ were unable to find definitive evidence to charge their suspects. They were indeed unable to confirm the indications were correct, but that's not the same as proving them groundless or non existent imo.
Your opinion really doesn't matter.
It is the evidence that matters.
The Policia Judiciaria didn't come up with any and that is on record in their Final Report.
Ignoring that fact won't make it go away and I cannot fathom why you find yourself still unable to accept the facts as they very obviously stand ~ that there is NO evidence against the McCanns ~ and the investigation is into Madeleine's abduction by a stranger.