Expect he is wrong and spread dangerously false information and pushed people toward danger. And you are also doing it here as well. His "correctness" is reflected in the number of infected people in the US, which is over 27000 now. Japan, despite having a head start and having a far higher population density, is at 1050. Let these numbers sink for a minute, and ask yourself what you could be doing better.

In Japan, people use masks to protect the community, which includes themselves as well as people around them.