I’ll add another line of thinking, out of Terry Pratchett’s Discworld novels — it’s possible that everything happens, and in each parallel reality the individual has the illusion of free will. In the frame of reference of the single reality, free will is a reality (it’s what distinguished that specific reality from an infinite number of other realities where heisenberg’s uncertainty principle threw the spin of a single photon the other way). In the multi-verse frame of reference, choice seems irrelevant because all possible combination of choices are made.
tl;dr — it’s possible that determinism is an illusion as well, if every possible thing that could happen does happen :)
The funny part is that I think Wilson Allen Campbell III actually comes to the same conclusion as you do, that there is a dire need to communicate — even though, if you didn’t believe in free will, there’s no such thing as “need”, since everything happens in a preordained, deterministic way, and the “system” cares nothing about the truth, only following its deterministic path :)
The way I walk this tightrope is to believe that the universe I experience is deterministic (the same way I believe the chair I’m sitting on is mostly empty space), but I behave as if I have free will (and the chair I’m sitting on is truly solid). I’m not sure if this counts as cognitive dissonance, or if it’s just a peculiar coping skill.
Fun fact I’m sure Wilson Allen Campbell III will appreciate, I believe that there is no God, but I behave as if there is “good” and “evil” :)