Madeleine's disappearance will likely turn out to have a simple explanation. A simple explanation is not easy when you put the parents in the frame, it is if you put an abductor in the frame. This is patently obvious even to "sceptics" but most just can't admit it.
If a supporter can solve the basic conundrum of the mechanics of an abduction I might listen and have a rethink. No one has come up with anything which is much more than "the parents couldn't have done it QED", whatever "it" is, so it must have been an abductor. The supporters cannot even agree on how, when or by whom an abduction was executed, they only agree one did occur at sometime or another on 3rd May 2007. So not very convincing.
Until the basic conundrum is resolved I am left with a sort of "self selecting default position". Which I don't necessarily like as a principle. The principle you understand not the position. Any discussion eventually finishes up talking about foundation bolt sizes before you know the size of the structure, as it were, so we go around forever.