Given the nature of this discussion, I understand it begs for more latitude. But I ask: what is "free-will" supposed to be other than a "feeling"?
It's supposed to make an individual "morally responsible for their actions".
It's specifically tailored to take away any "excuses" a person might present in order to argue that they are merely a collection of ever-changing reactions to their environment.
It traps people into disproportionately "blaming" and "hating" any proximate, apparent human "cause" to the exclusion of all other factors.
That's the ONLY reason we've been infected with the concept in the first place.