I don't think I understand what you say there. If the virus is in the air, the logical thing is to wear masks to stop its spread. The mask, especially is to protect others, and the community in general from suffering the epidemic. You should not wait until there are many cases of coronavirus in your area, you have to take them before there are cases, so that they have a real effect preventing the virus from spreading from other areas. The virus can take 15 days to show symptoms, some people carry it without symptoms, in 15 days, a single infected person can infect an entire city and cause a chain reaction with thousands of deaths. What sense is there in allowing the possibility of this happening when there is hardly any sacrifice for everyone to wear face masks on the street.