Hypothetically, science proves free will isn't real

[Edwardo Piet]

There's no way hard determinism could ever undermine rationality because whether hard determinism is true or not, what we have always deemed to be the concept of rationality is the same either way.

If fatalism is true rationality is undermined. Fatalism is not true because choices still exist and are still part of the causal chain.

Soft determinism and hard determinism are identical on the outside. Soft determinism is belief that determinism is compatible with free will. Hard determinism is belief that determinism is incompatible with free will. Soft determinism is compatabilist determinism. Hard determinism is incompatabilist determinism.

The free will of compatabilism/soft determinism is undeniable. There is a difference between voluntary and involuntary actions and between a choice made with a gun to your head and a choice of what to have for breakfast, whether determinism is true or not.

Hard determinists don't accept soft determinism because they think compatabilism/soft determinism is trivally true and pointless and it doesn't address the question.

I'm a hard determinist but I'm not a fatalist. I'm a hard determinist because I'm not a soft determinist, not because I'm a silly fatalist.