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[Ms. Toad]

44. Ohio's doctor Acton puts it this way:

It's like layering swiss cheese.

Social distancing is helpful - but that layer has holes because even 6' is not necessarily safe because of lingering droplets & surfaces
Exposure to smaller crowds is helpful, but because even smaller crowds can include infected people that's another layer with a hole
Fewer exposures are helpful - so limit the number of times you to out - but each time is a potential exposure, so that's another layer with a hole
Masks help - but those (literally) are one or more layers with holes.

But when you layer each of these on top of each other, the holes aren't likely to line up - making it harder for the virus to reach you.

Each layer you remove (like removing the social distancing inherent in personal services) makes it more likely the holes will line up an the virus will find its way through to you.