It was untrue, but saying that masks protected other people created powerful social pressure to wear masks. Which is probably why we haven’t heard the last of masking. From el gato malo at boriquagato.substack.com:
masks are trying to make a comeback.
despite the absolutely staggering amount of data refuting the idea that they work to stop any kind of respiratory virus (or even bacteria), it just will not go away.
i think it’s always going to be with us. the damage was too deep and there is a certain sort of person who is just never going to let it go.
because this was their happy place.

i think the mask-querade really came down to one potent messaging mantra repeated endlessly until it broke brains and shunted aside critical faculties thereby becoming endlessly integrated into medical mythology:
“your mask protects me.”
“your mask protects me” was made up science but it was phenomenal propaganda.
this pseudo-moralistic psyop probably cannot ever be cured among the anxious and authority craving. it was just too perfect.
it’s a societal spirochete penetrating the blood brain barrier and making mad those it infects. honestly, it’s worse. it’s basically herpes. and herpes is forever.
every time you get run down, it’s there, waiting to flare up.