Free will is not an entitlement, but is something you develop with conscious effort. Both sides of the argument are correct based on the premise they use; whether you expect to be entitled to free will at birth or whether you expect to earn it. In my experience, free will is developed through effort and self awareness. We are only born with the capacity for free will. For example, most children have a narrow adaption to various types of food. They may hate broccoli. This aversion to broccoli is not free will but determinism. As most children get older, they learn to overcome this childhood determinism. We develop more free will in terms of food selection and may start to eat broccoli. This comes from learning to question childhood biases. As you expand free will, more and more, you need to question and challenge other forms of determinism. Some of these come from personal conscious and unconscious bias while other come from collective unconscious bias. There is also collective conscious bias. For example, what you learn in school can bias how you look and think about the world. Collective bias is tougher to overcome since you may feel the need to run with the herd. The herd will even pressure you choose against free will in favor of group determinism. If you were a democrat try to argue republican and watch the herd reaction. Instinct is deterministic and compels us to integrate with a herd by sacrificing free will. In my mind, science is a work in progress. This is true of all areas of knowledge. If it was at steady state there would not be any need to do further research. There is no expectation that what we have today will be exactly the same in 1000 years. So almost everything is open to challenge if you think long-long term. This allows free will even with rational determinism.