It’s unfalsifiable because it requires studying a whole community and sequencing every SARS-2 infection to attribute “blame” to the source of the infection. Tha

It’s unfalsifiable because it requires studying a whole community and sequencing every SARS-2 infection to attribute “blame” to the source of the infection. That is very difficult to do and that is why such an RCT does not exist. And yet most of the world is performing this intervention anyway. That’s the brilliance of “my mask protects you”. It’s not feasibly falsifiable. “My mask protects me” is very easy to falsify. That’s why we have one RCT that studied exactly that and failed to reach significance. Again, the theoretical MoA of masking only makes sense if SARS-2 spreads via respiratory droplets. If it spreads via aerosols, the sub-micron aerosol particles stay aloft for minutes-hours and bypass the comparatively giant holes of the mask with ease. The sightly altered directional flow is largely irrelevant. You can watch any of the many videos of someone vaping with a mask on/off to see what I’m talking about. Imagine that every time you exhale.