Masks help prevent projectiles such as coughing or sneezing but so do coughing and sneezing into your elbow..... put on a mask wearing goggles or glasses.... what do you think makes them fog up..... germs escape around and through the masks.
If you want to talk about being perfect, you can criticize anything all day long. Masks do not catch 100% of exhaled vapor, but they are effective. How is it possible that you do not know that?
