There is no such thing as free will, but we're better of believing it anyway.

It's not as if there's a dichotomy where either pure determinism is true or we have free will. It seems perfectly reasonable to conclude that while there exists some irreducible randomness at the quantum level, we as humans don't have any control over that randomness, and thus while "pure" determinism might not be true, the classical universe can still be understood as a causally determined system. This would be similar to saying that gravity is a very fluid force, it fluctuates at the quantum level, but we can still make highly accurate predictions using the force of gravity on Earth as 9.8m/s2.

It's not that I feel quantum randomness is proof of free will. It just indicates that it could be. Macroscopic determinism is just large odds. it is random, but the chances of large changes happening are so, so close to 0 that we don't really see the effects of it in most situations. And if something small does effect greater events (chaos theory, butterfly effect) we can't see the cause and cannot appreciate it. Oh btw, quantum determinism doesn't say that gravity fluctuates. Plus our experience of gravity is caused by an average pull of all the particles that make up earth(alternatively an average bending of spacetime). Even if there were changes on the microscopic scale, they would balance out on average and not change appreciably.

My belief in free will stems from my experience of consciousness, not because the quantum is probabilistic. I feel that free will and consciousness are intertwined or that free will is a consequence of consciousness, but I can't prove it or anything. Plus I don't believe in your free will. Just my own. To elucidate: I don't mean that I believe that you don't have free will, just that you might not.

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