I see two reasons why free will might not exist.
The first is this: People make decisions based on their genetics (temperament, intelligence, etc), and also based on their environment (the decision they are making and the circumstances under which they are making.) Since people ultimately control neither their genetics nor their environment. How can they really be blamed for anything they do? and furthermore, how can they have free will.
The second is this: If there really is a God (and I believe there is, but bare with me if you don't) and that God knows everything, that means that he even knows the future. If God knows the future, and god is never wrong, that means the future is unchangeable, it is already set in stone, its static. Then no matter what we do we can't change it. If we can't control our own future, do we really have free will at all?
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