If the McCanns did not decide to leave their children unattended, Maddie would not be missing right now. But yeah, blame the Portuguese people.
McCanns left Madeleine because they were copying the 'listening service' which Mark Warner advertised in their booklet and was performing as a service on regular basis in many of their resorts.
1000s of parents left their children sleeping alone in their rooms in Mark Warner resorts all over the world and Mark Warner staff would go round ( same as the Tapas group did) and would 'listen' to these left alone children.
When McCanns arrived in Portugal they were told Ocean Club has no listening service but they weren't told there were many burglaries in the surrounding apartments.
If they were told to be careful and that the apartments are being broken into the McCanns would never leave their children alone.. they simply thought this was safe thing to to.. as it was being done in other Mark Warner resorts.