ok doser
lifeguard at the cement pond
I explained, clearly, specifically and concisely.
Masks only reduce the chance of an infected person infecting somebody else. It doesn't completely eliminate the possibility. So if you know that someone is sick, a mask isn't good enough- you shouldn't get anywhere near that person. The sick person needs to be in quarantine.
you're ignoring asymptomatic transmission
From a public health viewpoint it looks different. If you can reduce the rate of replication, i.e. the number of people who get infected by a sick person, that is already a huge help.
as the data in the OP show, data from the CDC, that perceived reduction is an illusion