> No one earnestly believes that they don't have free will, because if they did, it would result in obvious deviance in behavior.

That's just not true. I'm not convinced I have free will, though in my day-to-day life I admit it makes no difference whether I make choices or merely experience the illusion of making choices. And it's certainly not edginess that drives my uncertainty. I could probably find you talks by at least one person that's quite convinced they don't have free will and would try to convince you of the same.