Certainly Japanese people look out for their own self interest. And there are non altruistic reasons for wearing masks - including, if you are female, skipping

Certainly Japanese people look out for their own self interest. And there are non altruistic reasons for wearing masks - including, if you are female, skipping makeup. I don't buy into the stereotypes that you mention, but I do believe that Japanese manners, in general, make it easier for people to coexist in crowded places. That includes wearing masks. And maybe I'm completely wrong about that. I still think that if more asymptomatic people in the US wore masks in public (and I don't think complete distancing is sustainable long term), the spread of this could be slowed. So I do intend to wear the masks I purchased when they arrive. I do hope I keep up with that resolve. On my last trip to Japan I had a cold and wore masks to try to be polite and avoid spreading my germs. They really aren't that comfortable.