Checking their three children every 30 minutes or so, in these circumstances was not only inappropriate, it was damn right dangerous, crying out for any would be abductor, peadophile to simple walk into apartment 5A and take one or other, (or even all three of their children), via the unlocked roadside door, which Gerry McCann was responsible for after his 9.05pm check!
Why would any parent in those circumstances, leave a door unlocked which was on the far side of the premises from where he, his wife and the other 7 group members were all sitting, with no possibility of knowing one way or another whether anyone had simply walked into the apartment at their leisure, and taken one (or potentially two, or all of them) of the McCanns children?