Human test animals.
Humans have always been test animals, going back to the days of the first to try a bright colored berry on a bush (for example).
They either died, or didn't, and thus began the process of learning what "works" and what doesn't.
Why wouldn’t we allow patients who are at serious risk of death to try whatever they and their doctor think might save their lives? Without significant evidence that it’s going to be harmful, why not give it a shot?
I’m for medical freedom. Individuals should have the CHOICE to decide what is best for their own health and wellbeing in consultation with their doctor without big daddy government stepping in between to decide whether they’re allowed to take risks. If someone is likely to die, let them try anything within reason to live.