This has been addressed a number of times.
That's typically what happens when one person fails to acknowledge that they have heard and understand what the other person is saying.
I have heard what you and Peter Van Inwagen and Albert Einstein and Baruch Spinoza and Trick Slattery and others whom you've quoted are saying.
You are all saying that if our choice was causally necessary and thus inevitable, then it is as if choosing was never happening. The problem with that claim is that we can observe choosing actually happening. So, the claim is false, and the notion that choosing is not happening is apparently a delusion.
You are all saying that if our choice was causally necessary and thus inevitable, then it is as if the choice had already been made for us, by someone or something else, long ago. The problem with that claim is that we cannot get that imaginary someone or something else to pay for the dinner that we ordered. We alone did the actual choosing and the ordering, so we alone are held responsible for the dinner bill.
You are all saying that if our choice was causally necessary and thus inevitable, then it is as if we could not have made any other choice. The problem with that claim is that it exaggerates the effect of causal necessity to the point of eliminating the notion of multiple possibilities. The notion of multiple possibilities is essential to intelligence. It is built into logical operations like choosing, planning, inventing, designing, etc. It is how we deal logically with matters of uncertainty as to what will happen or what we will choose to do. The correct statement is that we "would not have" made any other choice, even though we certainly "could have" chosen something else.
But you ignore these issues. Instead, you simply repeat the same claims over an over, as if they had never been addressed.
For example:
... according to your own definition, there are no alternate actions at any point in the progression of events within a deterministic system.
Choosing inputs multiple options, the many things we can choose, and outputs a single choice, the one thing we will choose. No alternate actions
will be taken, even though there will always be alternative actions that actually
can be taken.
As each and every step of the 'consideration' process must necessarily result in the inevitable action, the item you order, the 'real possibilities' of the menu are someone else's necessity.
The restaurant menu is the same for every customer. It lists the many dinners that every customer
can order. It is up to the customers to decide for themselves what they
will order. The decision process is unique to each customer. They will each have their own taste preferences, their own dietary goals, their own prior meals earlier in the day, etc. These become the reasons that causally determine what they will order for dinner tonight.
Choosing is a deterministic process in which each thought and feeling during our consideration of the alternatives is reliably caused by our prior thoughts and feelings. By logical necessity, there will be two or more alternatives that we
can choose, and one alternative that we
will choose.
Nobody, according to your own description, has an alternative in any given instance of action.
As long as we are talking about what "will" happen, there are no alternatives. But as soon as we shift to speaking of what "can" happen, there are always multiple alternatives. We often do not know what will happen, so we shift from the context of what will happen to what can happen, in order to be better prepared for what does happen.
An alternative is a possibility, something that can happen or that can be chosen. The notion of "alternative" exists only within the context of possibilities.
When a determinist conflates the
multiple things that can happen with the
single thing that will happen, telling us that what can happen is limited to what will happen, they create a paradox that breaks the logical intelligence required to perform choosing, planning, designing, etc. And, since this intelligence has evolved by natural selection to enhance our survival as a species, I suggest we avoid destroying it.
Each according to their own non-chosen state and condition...including the related necessary thoughts and actions being necessarily experienced.
Perhaps you do not realize that the thoughts and feelings themselves alter the state and condition of our own brains. If you've ever studied for an exam, then you must be aware that you are able to reinforce and strengthen the neural paths that will help you to recall the relevant facts when you read the questions on tomorrow's test. By your deliberate choice to study, you have altered the state and condition of your own brain.
Every choice we make, and every action we take, effects changes in the state and condition of our own brain. From the moment we are born, we are active participants in our own creation.
As to determinism and free will, they are compatible when correctly defined and understood. Determinism simply asserts that all events are reliably caused by prior events. Free will is the event in which a person decides for themselves what they will do, while free of coercion and other forms of undue influence. When a person is free to decide for themselves what they will do, then their choice will be reliably caused by their own goals and their own reasons. Thus, both determinism and free will are fully satisfied.