JimmySeal comments

@Yubaru

Outside of the fake marriages, divorces between spouses, thus possibly losing the "spouse" visa, those I understand, but yet I am curious to know more details on how the children of Japanese nationals had their visas taken away.

"Child or spouse of a Japanese national" is a Japanese visa category. It's entirely possible that 100% of those who lost their visas were spouses but that the available statistics didn't provide any further granularity beyond visa category.

Why would a child of a Japanese national need a visa in the first place? They are Japanese. Unless of course they made the choice to NOT take their Japanese citizenship, thus living here as a foreigner and NOT as a Japanese citizen, making them the same as any other foreigner in country, having to follow the immigration laws and having a residence status.

They would need a visa if they were adopted and had no Japanese biological parents, or if they had foregone their Japanese citizenship. "Child or spouse of a Japanese national" is a residence status.

If you are getting into an airliner, will your best impression be formed if you saw the Captain and he's glugging water?

I wouldn't care in the slightest. What kind of psychopath would take issue with that?

How about salesladies in the shop glugging water?

I think it would be a bit rude to be drinking in the middle of interacting with customers, but if a clerk wants to take a wip when there's a momentary lull, I would not take any issue with that.