Who is morally culpable? 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.
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.