How dumb is Daniel Dennett? Umm, not very. From what I've read of his work he seems to be pretty smart, which is why I suspect that this Aaron guy is misunderstanding his argument. I note that his summary is in fact a summary of somebody else's summary.

I haven't read Freedom Evolves, but my guess is that Dennett was actually making an argument that it's possible to simulate, in a deterministic universe, entities which have "free will", or at least which believe they do. I doubt he really makes an argument based on confusing two different meanings of the word "unavoidable".

Though I'm happy to be proven wrong if anyone can post some actual quotes from the book.