If masks don't stop COVID, why are they being made mandatory?
(aapsonline.org)
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They probably reduce the spread, not by protecting you, but by protecting others.
It seems like "security theater" designed to calm people down.
Even if a mask reduces transmission by say 30% in a place like a subway or crowded bus that is reasonable.
I still don't feel the need to wear them out in public here. We have like 100 active cases in my area of over 100K.
In retail we'd call them shelf-talkers. No salesman is required explain to the consumer.