I've seen those videos Kevin, I'm basing it on the fact that our new infection numbers have not decreased since masks were compulsory. Health workers wear them plus more protection and are still catching it. The states in the US where the most masks are worn have the highest case numbers.
The CHO says they can reduce infections by 15%. That's surgical masks when fitted and used correctly and replaced every 4 hours. In my opinion it's a lot of hassle and inconvenience for a possible >15% reduction.
Anyway I wear one just to avoid the fines and dirty looks !