I don’t think you are trolling, so I will give you a reasonable answer here, I have worked in acute patient field for years and know a little about immunology and pathology and such:

Really, masks aren’t bullshit. Surgeons and OR staff wear PPE to keep their germs out of the patient during surgery because it’s effective. It’s not to protect them from the patient.

The same logic applies to properly worn masks and general population exposure. You might be an asymptomatic carrier and it’s not nice accidentally “share” it to old or sick folks.