I am not convinced that being souls would give us the highest freedom. Being all-knowing and all-powerful would give us the highest freedom.
I do some things even though I don't want to do them. Here are some things I have done, currently do or will do even though I don't want to do them:
1. Breathe
2. Eat
3. Drink
4. Sleep
5. Dream
7. Pee
8. Poo
9. Fart
10. Burp
11. Sneeze
12. Cough
13. Age
14. Get ill
15. Get injured
16. Sweat
17. Cry
18. Suffer
19. Snore
20. Think
21. Feel
22. Choose
23. Be conceived
24. Be born
25. Remember some events that I don't want to remember
26. Forget information that I want to remember
27. Die
To prove me wrong, you would have to forever refrain from doing the above 27 things and instead do the following things:
1. Live forever without consuming any oxygen, fluids, or food.
2. Do things other organisms e.g. tardigrades, dolphins, chameleons, etc. can do.
3. Teleport everywhere and everywhen.
4. Prevent all suffering, inequality, injustice, and deaths.
5. Make all living things (including the dead ones and the never-born ones) forever happy.
6. Be all-loving, all-knowing, and all-powerful and make all the other beings also all-loving, all-knowing, and all-powerful.
7. Own an infinite number of universes and give all beings an infinite number of universes each for free.
Once you have done the above tasks, I will be convinced that you have free will. If I had free will, I would have already done the above tasks.
I carried out experiments to test the roles played by our genes, environments from conception to the present, nutrients from conception to the present, and experiences from the womb to the present. These experiments were not published in any journals because I carried them out alone and I was my only test subject. I compared myself with myself under different situations e.g. how lack of oxygen affected my decision making, how lack of water affected my decision making, how lack of food affected my decision making, how lack of sleep affected my decision making, how cold and heat affected my decision making, etc. I also compared myself to how I was before significant life events with how I was after significant life events. By significant life events, I mean being kidnapped, being raped, watching people murder each other, being in natural disasters which killed lots of people, relatives being murdered, etc. The more I experimented and compared, the more it became clear to me that our wills are determined and constrained by our genes, environments from conception to the present, nutrients from conception to the present, and experiences from the womb to the present. You can do the experiments on yourself - it's not necessary to take my word for it.
How much do you know about neuroscience? Have you ever seen PET scans and functional MRI scans of humans? I have. If you want to learn more about how choices arise in brains, I recommend that you start by reading this book: "Determined: Life Without Free Will" by Robert M. Sapolsky. It is available on Amazon Kindle. If you want to discuss the book with me, I am happy to discuss it.
If I had the genes of a banana tree, would I be able to type this post? No. I have seen many banana trees and none of them can read or type or even know English. They are probably not even sentient.
If the zygote that was I when I was conceived was placed inside an oven at 250 degrees Celsius for an hour would I have become the adult I am now? No. The lethal environment would have destroyed the zygote.
If the zygote that was I when I was conceived was deprived of all nutrients would I have become the adult I am now? No. The lack of nutrients would have killed the zygote.
If the zygote that was I had all the correct genes and was in the correct environment and received the correct nutrients then I would have been born as a healthy human baby. If that baby had different experiences from me such as learning Japanese instead of English, I would not be typing this message.
So, do you now see the roles played by my genes, environments, nutrients, and experiences in the typing of this post? This is why I am convinced that we don't have free will. Do you understand my thoughts and reasoning?
Something being determined is not the same as being predictable. For example, earthquakes are entirely deterministic but are hard to predict accurately.
Whether your prisoner chooses to escape from the prison or stays in the prison is not free from his genes, environments, nutrients, and experiences. Whatever he chooses will be the result of the interactions of the genes, environments, nutrients, and experiences.