It's a simple and easy way to reduce chances of spreading it to another person. It diverts airflow from directly forward, changing the distance outward that aer

It's a simple and easy way to reduce chances of spreading it to another person. It diverts airflow from directly forward, changing the distance outward that aerosols from your mouth go. Since, as you point out, this virus is spread via aerosols, this impacts the chances of spreading it, by reducing the contagion radius around you.