Edit: We need to provide enough masks so that people don't feel like they are depriving the hospital system. Also, we need more corporations in America to step up and set an example, protecting their workers and customers. People should stay home, but when they have to venture out (or are needed for work), they should be wearing masks!
This goes against the current WHO recommendation
> If you are healthy, you only need to wear a mask if you are taking care of a person with suspected 2019-nCoV infection.
It is now proven that people with no symptoms spread the virus. Breathing virus into a cotton sheet is obviously safer than breathing on other people, despite being far from perfect.
Based on what evidence exactly?
> Considering that under certain conditions the virus can stay in the air for up to 3 hours, masks definitely are helpful.
Those conditions being using a Goldberg Drum designed to keep aerosols that can't stay airborne for as long as possible? If yes then yeah sure this virus can survive in the air for 3 hours, but that isn't normal reality. It can't stay aloft that long, it will hit a surface.
Goldberg Drum: https://academic.oup.com/aje/article-abstract/68/1/85/188529...
You really only need the mask if you're going out and symptomatic. Even then, as noted, leave the masks for the people that are encountering sick people daily. They need them way more than you do walking around buying groceries.