This is an example of gross oversimplification from one's own, very limited experience. You see how many people? 20? 100? Even 1000? The figures on mask wearing vs. getting this disease are in the millions.
In my state, every time they impose a lockdown or put limits on the number of people allowed to congregate indoors, every time they make mask wearing mandatory, the disease figures start to turn around and go down. Lots of grumbling and lots of individual financial hardship, to be sure. But the line on the graphs goes down.
Then, they reopen everything too soon, and the figures start to go up again. It's such an obvious one-on-one cause and effect that I can't understand the continued resistance to masks or vaccines.
This plague won't go away until we have consistent cooperation from nearly everybody.