Sugar; the sweet taste of temptation. Now add this temptation (wielded by others through suggestion) to what I wrote and you may comprehend how easy it is to deceive others to destroy themselves, by tricking them to consent by free will of choice to adhere to want (temptation) over need (self sustenance)?

In short: the so-called backbone of deceiving others to consent to self harm is temptation. Now who is nuts enough to consent to deprive themselves of oxygen by putting a mask over their mouths and noses; after being explicitly told that "I can't breathe" leads to death?