>The most simple face mask (not a gas mask) does not protect you from environment, it protects other people from you.
>Moreso a mask can be a cause for reinfection with virus, since you are breathing back in what you exhale.
>Hoarding prevention is also a very important task in the midst of a crisis. Hence WHO recommendation is justified.
These three sentences can be boiled down to:
- WHO's recommendation is justified to prevent the hoarding of that item because:
If you're sick, wearing it will harm you and protect others. If you're not, it's useless to you.
Therefore, only sick people wanting to remain sick should wear them. That excludes physicians who may not be sick, and do not wish to remain sick if they already are.
Furthermore, is the protective property on the simple face masks anisotropic? How does it protect in a way and not in the other? Does a mask of non null thickness and non null fabric count protect less than no material? Will it prevent absolutely no harmful particle from getting to me?
Sick++|| Healthy (works when sick wears it)
Sick+ +||Healthy (fails when healty wears it)