Internal necessity is not ignored. It goes by the name "choosing". And when that choosing is free from coercion and other forms of undue influence, it is called "free will".
That's an attempt at rebranding. Slapping a label onto a process where it doesn't belong. Putting a baked bean label on a can of spaghetti and meatballs does not make it a can of baked beans.
Odd, but I've had the same complaint of the hard determinist argument. Slapping the label "free will" onto freedom from causal necessity does not change what free will actually means: an unforced, voluntary choice that we make for ourselves. Free will is a choice that is not free from causal necessity, but only free from coercion and other forms of undue influence.
There is no choice in necessitation.
If it is causally necessary that you will perform addition, then you will perform addition, and there will be two or more numbers for you to sum.
If it is causally necessary that you will perform choosing, then you will perform choosing, and there will be two or more alternatives to choose from.
So, obviously, "there is no choice in necessitation" is a false statement.
If the events of the world shape and form you and your thoughts and actions, that is not a matter of 'choosing.' It is necessitation, determinism rather than choice.
Whenever it is causally necessary that choosing will happen, it is not an
either necessitation
or choice, but a
both necessitation
and choice.
''How could I have a choice about anything that is an inevitable consequence of something I have no choice about? And yet ...the compatibilist must deny the No Choice Principle.” - Van Inwagen
Of course we deny the "no choice principle", just like we deny the "no addition principle". Both choosing and addition happen in physical reality. Causal necessity insures that they both will actually happen exactly as they do happen.
Choosing is a deterministic event that necessarily must happen whenever we are faced with two or more courses of action, which causally necessitates that we decide what we will do. Free will happens to be a deterministic event.
Thus, free will and determinism are 100% compatible.
Choosing requires the possibility of taking a different option.
That's backwards. Actually, it is the possibility of taking different options that requires choosing.
Determinism by definition does not permit alternate actions, hence there is no choice, whatever must be done is done.
Determinism, by definition, includes all events, and therefore guarantees that the menu will be there, in our hands in the restaurant, requiring us to make a choice (or go without dinner). As you say, "whatever must be done is done", and that is what is done. Determinism has not changed what will be done. Choosing will be done. And we will necessarily be doing it.
”If the neurobiology level is causally sufficient to determine your behavior, then the fact that you had the experience of freedom at the higher level is really irrelevant.” - John Searle.
If my neurobiology is causally sufficient to determine that I will choose the Salad, even though I could have ordered the Steak, then it is I, myself that has done this choosing. If it was Searle's neurobiology that chose the Salad, then he can damn well pay for it himself.