Maciej Cegłowski at Idle Words wants to make mask wearing a social norm:
[…] The point of wearing a mask in public is not to protect yourself, but to protect other people from you. We know that many people who fall ill won’t show symptoms during the time when they are most infectious. Some people may even remain asymptomatic through the whole course of the disease, never knowing they had it.
The safest thing to do is assume you’re sick all the time, and wear the mask.
The job of protecting you, meanwhile, falls to everyone else! That’s why it’s so important that we adopt mask wearing as a social norm. When enough sick people wear masks, even of the most rudimentary kind, it becomes difficult for a disease like coronavirus to spread in the population.