Morning Alan, and Happy New Year to you
I am familiar with Sam Harris and his arguments that free will is an illusion. But there was nothing in this video clip which has not already been discussed in this thread. I fully agree with the rabbi's comment that the free will of the human soul is a mystery, and it will remain a mystery. The fact that we can't understand it or explain it in terms of human science does not mean that it does not exist. And Sam Harris proves the existence of free will by freely using his considerable intellect and intelligence to try to explain it away.
Free will is not a mystery, it is wrong.
Calling it a mystery is just obfuscation and euphemism where there could be honesty and clarity.
It is not possible to make a meaningful choice on a basis that is free of relevant considerations; rather, a choice is a consequence of it's determinant factors otherwise it is not a choice at all, but merely a random, totally irrelevant, event.
There is no evidence for free will, in its full sense, and there never can be because it is an irrational concept. It is the concept of choice itself that is deterministic; whatever the mechanism of choice, whatever the chooser, be it a robin or a rabbi, a conscious mind or an unconscious mind, a computer program or a spiritual soul, none of these possibilities will turn a choice into something that it isn't.
We live in a deterministic universe; some find that idea abhorrent, at first, but really it is the only possible sort of conceivable universe - a non-deterministic universe would be an illogical universe, where nothing makes any sense.
Ideas like free will and souls and Gods persist not because there is any rational justification for them, not because of any evidence for them, they persist because they are ideas that have widespread appeal and so remain popular even today. Popular does not mean true, it just means popular, and the result when challenged to justify irrational beliefs is a deluge of obfuscation, evasion and euphemism. None of that stands comparison with just being straightforward and honest about things.