Because many cases are asymptomatic.
If an asymptomatic person wears a mask, they don’t spread it to others.
Are we seriously still not clear on that?
I don't know, what's the ruling from the CDC his week. First it was, then it wasn't then it was.
“You must wear a mask, because you might be sick”, sounds an awful lot like, “You might shoot someone, so you don’t need that gun.” If you are so worried about contracting any virus, then wear PPE, I don’t care. If you own a business and insist on people wearing masks, be my guest. I’ll take my business elsewhere, or do without. Trying to make people that you have no idea about whether they have a virus, or not, is not about health, it’s about control.