Determinism doesn’t give a squat about the meaning of something. It simply acknowledges that the motion of events\actions are due to a perpetual cause and effect relationship.
Those who think there is free-will on the other hand, they claim they have control and choices, that they are free from causality, and have control to work towards some seemingly meaningful purpose. It seems more meaningful to the individual specifically when they think they have control. So among other motives, I think that people are attached to the illusion of free-will because they are also attached to wanting to be able to create their own meaning, or have control of finding some sort of meaning or purpose to their lives.
I hear so often, those that believe they have free will, when faced with the deterministic viewpoint, they often respond, “what would be the point of that?” or “what’s the point if I don’t have control” So you see, ones search and drive towards meaning and purpose, is a primary motivation for people to want to believe they have free will. This is one of the many reasons why I am skeptical to believe that we have free will, people have ulterior motives to want to believe they have free will.