On the assumption of the Mcann's innocence I would imagine that not a day goes by when they don't agree with you.
Having said that I think
@Ban-jani was trying to provide a bit of balance to the burn 'em brigade and has rather backed himself into a corner.
I have been racking my brains trying to recall if I was left alone at an early age but can't remember that far back. At best I think it was a laissez faire approach to the safety of the children, "It'll be all right, that sort of thing just doesn't happen". Turn out that it does.
I have no real opinion as to whether they are odd or were covering their tracks. Not sure I could recount or account for all my movements in an hour by hour timeframe without conflicting, much less how I would react if the unthinkable had happened to a child of mine.