Re: Ch. 8: How "Ought" One Behave?
Yeah, they use the same argument about different reference frames. I think they appropriately take this "common sense" notion of free will when talking about morality. I don't think you can really do it otherwise.
Sam Harris talks about how "the illusion of free will" is really an illusion itself. Meaning if we really think about, we have no idea where our last choice came from, it just happened. (Why did the last random thought pop into your head?) But I think the first illusion is still more powerful -- it sure feels like we "could have done otherwise" even if we really couldn't have. So we'll always live our lives as if we're somehow making free choices (as Dennett says, the only kind of free will that matters), and morality doesn't make much sense without it.