Japan's monarchy was a Meiji invention; he had no power before that and has no power now. He's more like the opposite, a prisoner we specifically wrote into the constitution to have no human rights.
They expect repeated exposures to mean the west is weakened with lots of people unable to participate in the economy, while their population won't have that issue.
It’s probably easier that way to spin the situation as “your fault for not taking it”.
It varies though. I watch a lot of Chinese city walking videos and for example in Beijing lots of people (inexplicably given the above) wear masks, whereas in smaller cities like Guiyang almost nobody is.
It's surprising just how many people will continue to speed past these very visible cameras.