Free Will is whatever you freely will it to be. No pun intended.
Like theists discussing god, free will is debated without really defining it.
If you say 'I define free will as .a,b,c...' then debate can follow.
Well, issue comes in when statements are made such as "there is no such thing as free will, therefore as all actions are necessary, there is no such thing as responsibility!"
I expect that there may be a strong, well-definable concept of "free will" available buried somewhere at the heart of "common usage" which approaches concepts in game theory and math.
However one defines it, it must be capable of operating in a deterministic system, and of assigning responsibility to operation of choice.
It is like one of the U.S. Supreme Court justices said about pornography, "I don't know how to define it, but I know it when I see it".
"Free will" is when someone decides for themselves what they will do, while free of coercion and other forms of undue influence. It is literally a freely chosen "I will".
I define the elements on my
website like this:
What’s Free Will About?
In 2013, the Tsarnaev brothers set off home-made explosives at the Boston Marathon, killing several people and injuring many others. They planned to set off the rest of their devices in New York city. To do this, they hijacked a car, driven by a college student, and forced him at gunpoint to assist their escape from Boston to New York.
On the way, they stopped for gas. While one of the brothers was inside the store and the other was distracted by the GPS, the student bounded from the car and ran across the road to another service station. There he called the police and described his vehicle. The police chased the bombers, capturing one and killing the other.
Although the student initially gave assistance to the bombers, he was not charged with “aiding and abetting”, because he was not acting of his own free will. He was forced, at gunpoint, to assist in their escape. The surviving bomber was held responsible for his actions, because he had acted deliberately, of his own free will.
A person’s
will is their specific
intent for the immediate or distant future. A person usually
chooses what they will do. The choice sets their intent, and their intent motivates and directs their subsequent actions.
Free will is when this choice is made free of
coercion and
undue influence. The student’s decision to assist the bombers’ escape was coerced. It was not freely chosen.
Coercion can be a literal “gun to the head”, or any other threat of harm sufficient to compel one person to
subordinate their will to the will of another.
Undue influence is any extraordinary condition that effectively removes a person’s control of their choice. Certain mental illnesses can distort a person’s perception of reality by hallucinations or delusions. Other brain impairments can directly damage the ability to reason. Yet another form may subject them to an irresistible compulsion. Hypnosis would be an undue influence. Authoritative command, as exercised by a parent over a child, an officer over a soldier, or a doctor over a patient, is another. Any of these special circumstances may remove a person’s control over their choices.
Why Do We Care About Free Will?
Responsibility for the benefit or harm of an action is assigned to the most
meaningful and
relevant causes. A cause is meaningful if it efficiently explains why an event happened. A cause is relevant if we can do something about it.
The means of
correction is determined by the nature of the cause: (a) If the person is forced at gunpoint to commit a crime, then all that is needed to correct his or her behavior is to remove that threat. (b) If a person’s choice is unduly influenced by mental illness, then correction will require psychiatric treatment. (c) If a person is of sound mind and deliberately chooses to commit the act for their own profit, then correction requires changing how they think about such choices in the future.
In all these cases, society’s interest is to prevent future harm. And it is the
harm that
justifies taking appropriate action. Until the offender’s behavior is corrected, society protects itself from further injury by securing the offender, usually in a prison or mental institution, as appropriate.
So, the role of free will, in questions of moral and legal responsibility, is to distinguish between deliberate acts versus acts caused by coercion or undue influence. This distinction guides our approach to correction and prevention.
Free will makes the empirical distinction between a person autonomously choosing for themselves versus a choice imposed upon them by someone or something else.