How can you possibly know such a thing? The mask is more about reducing your spread to others, do you have reliable data on how many people you would have infected in lieu of masking? No, you don't.
All I know is I wore one and so did all my friends and it cut through all of us like a knife through butter. Nobody was spared. People think masks are going to save them. In my experience, they prevented nothing of consequence to me or the people I interact with.
How can you possibly know such a thing? The mask is more about reducing your spread to others, do you have reliable data on how many people you would have infected in lieu of masking? No, you don't.