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hippyjoe1955 Again, if you're working in a virology lab, you're not concerned with making other people sick; you're concerned about not getting sick yourself, so the protocols are totally different.
COVID is a new virus and masks were not the only thing affecting its spread. What was noticed almost everywhere where masks and social distancing was followed was a drop in flu cases. Flu is also a virus, so if your theory is correct, flu cases shouldn't have been affected at all. Of course the tinfoil-hat conspiracy theory says that doctors were falsely attributing flu deaths to COVID because Bill Gates was paying them to or something.
While masks are not finely-woven enough to stop viruses, since exhaled viruses are carried by water droplets, even non-medical cloth masks do stop those and are more effective than nothing.