They wear masks because masks work, and apparently they are bright enough to realize that. Also apparently, a lot of Americans are not.Most people in Asia wear masks because of the smog.
The mask you wear is for YOUR protection, not mine.
It's none of your business if I wear a mask or not.
If you wear a mask, why do I need one?
Before this phony flu pandemonium you could go into any medical facility and the personnel wearing masks would remove or lower them to talk to you.
IOW, most people are bright enough to know they wear masks for THEIR protection, not yours.
If you happen to be an asymptomatic spreader and infect other people, it "is" damned well their business.
WHAT is it, exactly, that is SO BAD about wearing a mask??