The parents were with 7 friends at the restaraunt  between 8.30 and 10pm. Surely all 7 friends wouldn't go along with a lie, if one of the parents was missing  from the dinner table for a fairly long length of time. The lie being that one of their friends had murdered their 3yr old  child...and the friends were happy to keep that covered up.

The hate campaigns for the McCanns arebased on them leaving their very small children unattended in a holiday apartment while they drink & eat with friends, I can understand that. It doens't mean the parents were involved in their daughters disappearance though.