is there free will?

[Philippus Flavius Homovallumus]

Well, if you are going to use smileys to be rude I could just leave, you know.

I just explained why determinism is required to hold people responsible for their actions.

Causation is required to reasonably determine the outcome of a proposed course of action, but in order for someone to be held responsible they must have a choice, i.e. at least two options.

They can both be accepted because they are compatible with one another.

No.

That's fatalism, not determinism. They aren't the same thing

Fatalism is the directing of events by an outside force, i.e. God. Determinism assumes the system directs itself. Your "causal determinism" is absolute and its results are therefore the saem as a fatalistic system.

In the UK there is a defence against murder called "autonomy" where the accused's faculties and decision making are deemed to have been bypassed by an outside agent. In your system:

"determinism says that under circumstances X, what will happen is that you will do A"

So, under the correct circumstance Harry will murder his wife, and under those exact circumstances Harry would always muder his wife. Therefore he cannot be held responsible because he is subject to the external circumstance.

So Free Will in your system merely appears to exist because you cannot accurately measure all the variables and therefore accurately predict the outcome of a situation.

actually that is why that kind of moral responsibility requires causal determinism. because that kind of moral responsibility is based on its consequenses and not on its intentions. moral responsibility based on intentions doesnt require causal determinism.

Generally morality accounts for both, so you would need a regular mbut not wholly deterministic system.