That’s about the only thing anyone can say they are honestly good for. With all the info avail about the masks, how can so many remain so ignorant? I suppose MAYBE a store owner might have the right to request his customers to wear a mask, but he also has the right to consider how much business he wishes to relinquish. If there is a choice, I daresay most would go to the store that meets their needs without the requirement of a mask.
The masks are good for one other thing: they give frightened people a feeling of confidence to go out and be around other humans where they participate in spreading the virus and building widespread immunity as the mask is totally — completely — ineffective in “stopping the spread” of a virus ... any virus ... completely ineffective in every respect.