because your mental state is a culmination of some mix of your genes and external influences, both in history and through the world now. If you are around p

because your mental state is a culmination of some mix of your genes and external influences, both in history and through the world now. If you are around people who consistently present ideas to you, there is a more likelyhood that your brain will accept those beliefs as facts. This is why indoctrination works so well. So just because you don't have free will doesn't mean your position won't change, in fact, it's evidence that it will change.