FDA says they work, so you believe they don't.Well, the FDA says it may help stop the spread if you already have it. So yeah... I'd say they don't work.
Using Face Masks, Barrier Face Coverings, Surgical Masks, and Respirators
Q: Do face masks and barrier face coverings provide protection from coronavirus?
A: Face masks and barrier face coverings should generally be used for source control, meaning they may help prevent people who have COVID-19 from spreading the virus to others. These products may also help limit exposure to respiratory droplets and large particles but are not a substitute for filtering facepiece respirators or surgical masks. Please refer to CDC's webpage for recommendations regarding use and care of masks.
Got it.