> Yet in some parts of Asia everyone wears a mask by default - it is seen as safer and more considerate.
In mainland China, Hong Kong, Japan, South Korea, Thailand and Taiwan, the broad assumption is that anyone could be a carrier of the virus, even healthy people. So in the spirit of solidarity, you need to protect others from yourself.
Some places take this idea very seriously: in some parts of China, you could be arrested or punished for not wearing a mask. In Singapore, which used to discourage citizens from wearing masks, it's now compulsory to wear one outside or risk a fine of S$3…