Following from an above quote I also believe that the Mcanns know more then they have said, but in their defence if either of them are guilty of anything they have done an excellent job of hiding it.
As for the death of 6 children, If they are guilty they won't want to be in general population as they will get Fked up. Nobody likes a Kiddy killer or fiddler. Best of all their faces have been all over the papers/news so its not like they can be hidden to protect anyone, unlike the recent story of the Kid in Blackpool forced to sleep in a coal cellar for a year. I would really like to see the kid get a new identity and then let everybody else know who his parents are so they get what's coming to them.
By the way when I was in Florida Late October/early November last year there was a story about a kid who had been taken from a house, I was sure that it was one of the family members, Did they ever find out what happened? There was no conclusion to it before I headed back home.