I was afraid that you wouldn't understand.
It implies that courts of law "have got it wrong".
I don't know what that means. Are you referring to having courtroom trials? Are you referring to deciding a defendant's guilt? Are you talking about fining or incarcerating them following guilty verdicts?
I think you need to explain why people should be held responsible for their actions,
if we do not make decisions of our own free-will.
Why wouldn't we do those things I just named even is free will were just an illusion (it's not like we would have a choice if it weren't)? Criminals need to be taken off of the street. They and others need to see the possible results of engaging in criminal activity. And maybe they'll repent* and be rehabilitated.
* Interesting trivia: the word penitentiary "is derived from the Latin term paenitentia, meaning repentance. A penitentiary refers to a prison or place of confinement used to hold and correct criminals who have been convicted of felonies."
It sounds like you think that if they don't have free will, we shouldn't deal with criminals at all. Do you believe tigers have free will? If not, when one escapes the zoo and begins terrorizing a neighborhood, should we allow it to continue doing so (it's not like we would have a choice if we also lacked free will).
It's really not difficult to adapt to this way of thinking. Nothing need change in our behavior once we know (it's not like we would have a choice if we lacked free will). My thinking hasn't changed at all. I continue to think and live as I did before I came to realize all of this. I live as if my ideas come from me and not my brain even though I know better, but that doesn't make a difference (it's not like it could if we don't have free will).
It's exactly the same regarding the question of whether all of experience is an illusion, not just free will. Suppose you somehow learned for an undeniable, iron-clad fact that there was no world outside of your consciousness corresponding to what you experience, that perhaps you are a brain in a vat after all or in some kind of matrix. OK, now that you've had a chance to get over the shock and assimilate and accept the truth of the idea, what are you going to do differently?
You now know that what looks like your finger isn't real, and neither is that burning candle, so you will the finger into the flame knowing that no such thing actually exists or is happening, and you feel the pain of fire anyway. Are you going to do that again? No. It's not like you would have a choice if you also lacked free will. NOTHING CHANGES, and this free will matter is the same. Realizing that free will is or might be an illusion changes nothing about how I go on living my life, because as with fingers and flames, what worked before still works following these kinds of revelations.