Have you ever involuntarily performed certain acts in your sleep, such as saying certain things, or making certain movements? Well, I think this says you're a biological machine with no free will, since you had no choice but to perform those acts, since they were involuntary acts.
The existence of involuntary acts does not justify an argument against free will. There is no question that natural determinism dominates human behavior, and the decision making process, but the degree of free will is open to question. Some form of compatibilism where a degree of self-motivated free will is compatible with determinism. Some forms of compatibilism even rejects true free will were 'to do otherwise' is an illusion, but decisions have 'wiggle room' (Dennett). Other forms allow a degree of free will in the decision making process.
It is the libertarian free will that asserts humans have the ability 'to do otherwise' over a wide range of human decision making processes, but this view fundamentally fails many ways. They argue from the perspective that humans are rational decision making beings. This fails to acknowledge many of our decisions, are predetermined by simply natural determinism, our human nature, culture, group dynamics, mental illness, and the chain of cause and effect events that lead to each choice,
The question is how much of a possible range in human choices is there 'to do otherwise.' Many argue that from the human perspective choices are likely made predetermined by too many factors for free will to exist, and rational choices simply follow the chain of cause and effect relationships of our past. Also, in most instances humans do not know whether they could 'do otherwise.'
My view is that the possible free will is within a narrow range of ;some' choices in the cause and effect outcome of a chain of events. One factor in the nature of our physical existence is the fractal nature of all cause and effect events is the fractal nature (chaos theory) of the range of possible outcome. This fractal nature of pretty much all natural events creates fuzzy boundary as to what is posibly free will and what is not. I believe we make decisions within a narrow range of possible outcomes, but these choices have more of a fractal nature and not truly free will.
I believe there is a limited role of free will in this process, because of the rational nature of humans, but it is difficult to objectively define. This is what I call the limited potential of free will decision.
More to follow . . .