Free Will is not an illusion, not a mirage arising from the perspective of the individual. It is the correct perception of the individual's perspective. We each believe ourselves to be free, and we are in fact so; that is to say, this perception of freedom is a correct detection of our position at the leading edge of a causal chain. That is the meaning of freedom; existing at time's frontier.
But for any other observing us we are simply the robot of circumstance. - They see us in the past.
Both perspectives are actual, and the judgments from those perspectives correct.