Were they vaxxed?
I agree with the Japanese politician that wants to restrict immigration. But they need to be careful. Americans who have assimilated after years stationed there like to buy homes there and live between Japan and the USA. The problem is not them, they are older, and married to a Japanese. The real problem is the other immigrants who never assimilate and demand people adjust to them. Saw a few of them in Kobe earlier this year. Also saw quite a few Americans who live in Kobe and Osaka who were not attached to the military. For the most part they hated tourists and preferred to be left alone. The immigrants Japan does not want are the same ones, Poland, and Hungary do not want.