I'm in favour of Brian-M's compatabilist version of free will. True, it is vague and fuzzy, and if we accept the universe as deterministic at macro scales, it is necessarily an arbitrarily defined sub-category of causal sequences. But although vague, it is considered socially useful. It is generally used to make the distinction between physical and moral responsibility - in the examples, previously posted, of forced or unwitting actions where the actor was physically responsible for the action, but would not normally be held morally responsible for it, we can say that they did not act entirely (or at all) of their own free will.
We are talking about science, the truth not morality or right or wrong.
I don't even consider it as philosophical subject but a scientific one. If we are trying to know the truth then ALL topic is scientific (based on reason, logic, mathematics, and empirical data.). These includes understanding of love, hate, perception, soul (if any), god, life, art, entertainment, music, social issues or anything under the sun. However, if you are not interested in the truth then just call your witch doctor.
Conversely, you act of your own free will when the action you take is broadly the result of internal processing without undue external influence. Which raises questions - what is external influence and what is internal? How much is 'undue'? Who decides?
You left Red holes above to muddy the water.
Internal and external stimuli and the state of your brain (depend your past history, upbringing etc.) determines the outcome. There exist just "Flow of Happenings" (FH) in the universe. FH includes everything what goes on inside your and my brain, in the Sun or in societal evolution.
There is no such thin as "undue" in this context of scientific investigation.
As for who decides, there seems to be a cultural consensus as to how such things are decided, although there may be a difference between the common consensus and legal and/or religious demarcations.
Of course there is cultural, societal, crime and punishment consequences for things happens as act or even for thoughts in the head that doesn't materialized in action immediately.
Concept of God was our first "odd man out".
The second one, which is much more difficult to kick out, is the concept of "Free Will"
Just like God, Free Will is an illusion. After several days of debate when still people can't see No Free Will then it becomes delusion.
Delude yourself to have Free will and feel good.
You can also delude yourself to believe All merciful, just, personal god exist, and feel good about it.
Unfortunately, our objective is not necessarily to feel good at the expense of truth but to find out the truth.