Because masks were promoted as protecting others, not the wearer. This didn't recognize that people put their own needs ahead of others. Seat belts can protect

Because masks were promoted as protecting others, not the wearer. This didn't recognize that people put their own needs ahead of others. Seat belts can protect me in an accident. So I wear them. With masks, (especially if I am young and not at much risk) I think "if someone is afraid of the virus, they can just stay home, why do I need to change what I do?"