Pump the brakes, sir. Let's leave the Fauci-baiting to the fringe websites.
You live in Japan, so you know well that Japanese often wear masks for a variety of reasons, including to reduce pollen and dust intake, and also as a courtesy to others when they have a cold. Add to this the desire to minimize any possible intake of virus, and you have your answer why Japanese still wear masks. They are on the tail end of an enormous spike in covid where their hospital systems were overburdened to the point where even pregnant ladies were getting turned away.
The US did not have the enormous surge that Japan did, the US's hospital system was not overwhelmed this summer, and the US population don't have a culture of wearing masks. In fact there is resistances against wearing masks, even when it may help fellow Americans. So take into account these cultural differences when considering the mask-wearing habits.