And this is why this thread is a failure. Because people like @Lacius present the logic, and other people downplay it as if they have a medical degree.There's a lot to debunk here, so everyone forgive me if I miss something.
Fauci said masks probably weren't helpful back when we weren't convinced anything other than medical grade masks were helpful, but as our understanding changed, Fauci said so. There was also concern that citizens would deplete medical grade masks, since those were the only ones confirmed to be effective at the time, when medical professionals needed them most. I can't think of a more intellectually honest position than to go where the evidence goes. That's a feature of medical science, not a bug.
The COVID-19 virus usually transfers from person to person via droplets of saliva, which masks are able to block. A mask doesn't have to block transference at the atomic level in order to be effective (and respectfully, that's a ridiculous suggestion). A virus is many times bigger than oxygen molecules, and saliva droplets are many times bigger than a virus. Cheap disposable masks and cloth masks are at least 50% effective at preventing infected saliva droplets from transferring from person to person, and that number jumps quite a bit with two masks on top of each other. That number is also higher with better masks.
If you don't like wearing masks, get vaccinated. It's as simple as that. The vaccines are 80-95% effective against COVID-19, which is better than the protection you get with a mask, and the CDC guidance is that you don't have to wear a mask in most situations if you are fully vaccinated. It's a win-win.
The only person who politicized the virus was the former president. He downplayed it and ridiculed mitigation techniques like masks for political gain.
We have the evidence.
Stop crying about a vaccine.