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> Who do you trust more - the robots or the human staff? And I'm asking about America, or maybe, in Japan as foreigner?

What do you mean with "trust"? Write down the right order? Or not spit in your food?

Both, mistakes or personal/ethnic/political dislike - not uncommon in these polarized times of "anything goes if you aren't caught".

That's IMHO not a concern at all in Japan. Being polite and accommodating to customers is held paramount.