Because masks don’t reduce transmission. Communication on this has been very clear. Masks don’t help. Frequently washing hands, avoiding contact with others, keeping your surroundings clean, and not touching your face does help. Masks give a false sense of security and reduce supply for those that need them.

I wonder why doctors and nurses use them then. They usw them in most situations. I wonder why they complain about lack of them. Since they are useless.

Sure, they are not as good as respirators. And we as general public should not bulk buy them now.

I wonder why in China and Korea, in counties most experienced in current situation, everyone is required to use them.

Common sense says that any kind of barrier between cough or sneeze droplets and my nose or mouth will reduce the probability of me breathing it in. I could tie a scarf around my mouth. It may not be perfect but even if it reduces transmission by 5%, Why not?

https://smartairfilters.com/en/blog/diy-homemade-mask-protec...

Has more info on studies related to this. I believe their claim is that tying a cloth around your nose/mouth is 50% as effective as a proper mask.

Could you cite me a research paper showing face masks don't reduce transmission?