The fundamental issue is no logic has been applied to any of this case. Why would I for example have staged this horrible scene, and then disturbed it myself, pulled the tape off her mouth, carried her upstairs, tried to untie the hands before I brought her upstairs. If I'd have staged it, I would've wanted the police to see it as I staged it. It's not logical. Makes no sense.
All children have accidents.
The motive is that uh uh JonBenet wet her bed and that you got angry. You lost it. You snapped and you killed her perhaps accidentally. You were downstairs. Maybe she came down.