Here is a link to the CDC research covering the period 1946 - 2018 that shows that there is no benefit in wearing a mask during a pandemic - https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article
Sars-cov2 is allegedly 120 nanometers wide - a medical facemask has holes that are 3000 nanometers wide, cloth masks much larger. So it's akin to trying to stop a basketball with a mesh the size of the channel tunnel.
A little from the Face Masks section:
In our systematic review, we identified 10 RCTs that reported estimates of the effectiveness of face masks in reducing laboratory-confirmed influenza virus infections in the community from literature published during 1946–July 27, 2018. In pooled analysis, we found no significant reduction in influenza transmission with the use of face masks.
This muzzle wearing malarky isn't about protection from a virus we all know that.