Can someone explain why wearing a mask won't help a

[Totally Tunsie]

14. Agreed. You can't rely that others who may be sick are wearing a mask.

Everyone needs to protect themselves, IMO. Since many are asymptomatic, they could be walking around with CV and not know it, putting you at risk if you encounter them. Your mask will prevent their output from being drawn in through your nose and mouth.

Also, there are homeless or persons who live in poverty who can't afford groceries, never mind masks. Don't expect them to take caution of your health.

Lastly, there's Mr. Macho Man - sweating profusely (but then, he always is), coughing without covering (because he never does), and brushing up against you (because to him this is all a "hoax" and a big joke). You think he'll wear a mask to protect you?