"Hi there! I'm a compatibilist. I'd like to show the incompatibilists, whether hard determinists or libertarian, how free will and determinism are compatible notions. It is time that you two lay down your arms, shake hands, and move on to some of the REAL problems that face humanity in this day and age, you know, war, famine, global warming, injustice, racial and religious persecution, etc. etc. etc."
I agree, the notion of free will is absolutely irrelevant. It tells us nothing about human nature, behaviour, drives, wants, needs, aspirations, how the world came to be in this state or how to fix it.
Free will distinguishes a deliberate act from an accidental act, a coerced act, an insane act, or an act caused by some other influence that can reasonably said to be beyond the person's control.
People are held responsible for an act that they do of their own free will.
So, the notion of free will is very relevant when determining the cause of an act.
For example, we hold Vladimir Putin and the Russian government responsible for the deaths and destruction in Ukraine.
The first step in fixing anything is to discover the cause of the problem.
The ordinary operational notion of free will simply refers to outward appearances, human behaviour as we observe it.
We actually do dig deeper than outward appearances. For example, to distinguish a deliberate act from an insane act may require expert testimony, psychiatric evaluation, and thoughtfully judging the evidence. And coercion can take indirect forms, like holding someone's family hostage rather than pointing a gun directly at the victim's head.
Digging deeper into the drivers and means of thought and action paints a different picture.
Any useful information is certainly welcome. But the notions of determinism and causal necessity are not useful in any way.
All events are always causally necessary, regardless of the specific cause. But in order to correct a specific behavior, we must know the specific cause. Was the cause a brain tumor? Then remove the tumor. Was the cause coercion? Then remove the threat. Was the cause a deliberate choice to profit at someone else's expense? Then take steps to alter how that person thinks about such choices in the future.
All of the utility of the notion of reliable cause and effect comes from knowing the specific causes of specific effects. And this is the basis of all our applied sciences.
Hence centuries of debate on the nature of free will, or its absence.
No. The centuries of debate originated with the notion that causal necessity was something that we needed to be free from, before we could decide for ourselves what we would do.
That 'free will' is not really the means by which we think and act.
Free will is not the "means" by which we think and act. We already come with the ability to think about, and then choose, what we will do. Free will refers to those choosing events where we do so while free of coercion and other forms of undue influence.
and (2) using the empirical notion of determinism, stripped of all its false implications.
False implications? Are we not working with the same definition of determinism?
The notion that determinism eliminates freedom is a false implication. Every freedom derives its meaning from some form of meaningful constraint. In, "We set the bird free from its cage", the cage is the constraint. In, "The lady at the grocery store was offering free samples", the constraint is the cost. In, "I participated in Libet's experiment of my own free will", the constraint is coercion or some other undue influence.
Universal causal necessity/inevitability is neither a meaningful nor a relevant constraint. What we will inevitably do is exactly identical to us just being us, choosing what we choose, and doing what we do. That is not a meaningful constraint, because it is basically us doing "what we would have done anyway".
And it is not a relevant constraint, because to be relevant it must be something that we can actually be free of. The bird can be set free of its cage. The lady at the store can offer samples free of charge. And people volunteer to participate in psychological experiments, like Libet's, rather than being forced to (as has happened on occasion in the past, but is generally illegal now). But
no event is ever free of causal necessity.
The incompatibilist brings up causal necessity (determinism) as if it were a meaningful and relevant constraint that we must somehow be free of in order to call ourselves truly free. But it is not something that we can be free of. Nor is it something that anyone ever needs to be free of, because it is not a meaningful constraint.
Every freedom we have, to do anything at all, requires reliable cause and effect. Universal causal necessity is logically derived from the assumption that all events are the reliable effects of prior causes. We, ourselves, are the reliable effects of prior causes. And we, ourselves, are the reliable prior causes of future effects.
But the incompatibilist's presentation of causal necessity (determinism) attempts to excise us from the causal chain. And that falsifies their version of determinism.
We are both using the same definition of determinism, in that every event is always the reliable result of prior events. But the notion that we are not meaningful and relevant causes, within that chain of events, is a false implication. And the notion that any other freedom we enjoy must also include freedom from causal necessity, is a false implication.
"Freedom from causal necessity" is an irrational notion. The thought that we need to be free of cause and effect before we can be the cause of an effect, is a self-contradiction that creates a paradox. So, let's stop doing that.