Zyr, I think you've been tricked into forgetting that the key word in this discussion (fast deteriorating into a debate) is omniscience. If it is known in advance what someone will choose, then it's a fact that he can't do otherwise and that he won't do otherwise. "Can't because he won't" is only true if omniscience is a factor or a condition in the equation. "Won't because he can't" is always true regardless of whether omniscience is part of the equation.
When you switch a question from the "won't because he can't" proposition to a "can't because he won't" supposition, and leave out omniscience, it becomes a trap for the unwary. You have fallen into the trap and are using arguments that do not include the omniscience factor to defend a proposition that can't be defended without the inclusion of that factor. The defense you are using is irrelevant in the one case and just wrong in the other.
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