I think it is moral and ethical (and is and should remain legal) for professional adults to voluntarily consent to risking their lives in exchange for payment.

It's not really anyone's place to dictate someone else's risk appetite. Stuntmen and Stuntwomen know what they are signing up for. They are the ones choosing to risk their own lives, not anyone else.

Some people really love doing crazy shit and making wild art. I still quote Terminator 2 decades later; it is epic art regardless of whether you personally like it or not.