[knzhou]

There's a difference between "X doesn't work" and "given the current circumstances it would be useful if many people believed that X doesn't work".

[sgift]

There's also a big difference between "x works very bad for the untrained population, but let's pretend it doesn't, because my worldview demands some media conspiracy" and "x works well".

[knzhou]

East Asian countries have almost everybody wearing masks. I really don't think using these things is as complicated as you're making it out to be.

[senordevnyc]

Seriously, how much mask training do you think healthcare professionals get? Nothing that a 2 minute YouTube video wouldn’t cover, I’d guess.