From a practical point of view, it is probably impossible to relinquish the notions of free-will and personal responsibility. After all, our criminal justice system is predicated on them, as are our personal relationships and what passes for order in our societies.
From both a scientific and philosophical perspective free will doesn’t make much sense, though. All our behaviour can probably be explained away as a product of our brains, our bodies, our genes or our environment.
The philosopher Mary Warnock once argued that if we lived under laboratory conditions where all the chance elements of our lives from birth could be forensically clocked and recorded, the decisions we made as our story unfolded would appear to be foregone conclusions. She claims that we only feel free because we are ignorant of our own genetic system and all the circumstances that programmed the computer that is our brain. Or as Spinoza apparently said, what we call ‘freedom’ is ignorance of necessity.
Just in case anyone is starting to recoil from this line of thinking let me reassure readers of this post that I do believe in free will. After all, I have no other choice.*
But when it comes to the OP, I also have compassion for the person it describes.
Maybe holding both ideas in your head simultaneously is the only way to go with this.
*Actually, that’s something Isaac Bashevis Singer once said.