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I believe it is an epidemiological/statistical reason.

Health care workers have a 100% chance of coming into contact. We cannot afford for them to be sick.

The vast majority of people wont be wearing masks so a few people wearing masks wont stop the spread so it is pointless. Even if you do wear a mask your chance of coming into contact with virus is low so you are wasting a mask for little to no statistical gain.

The n95 masks are very effective.

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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".

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".

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.

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

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