G.K. Chesterton told an amusing story of a young man who wrote to him extolling the truth of solipsism.
If you have a few free minutes, try, for fun, filling them with Google Translate.
The boundary between free will denial and impairment of reality-testing is difficult to discern.
Consider the analogy of playing a lottery.
Of course Manson acolyte Leslie Van Houten chose to kill, just as millions of law-abiding people choose not to kill.