It doesn't have to discover all the rules with no help. We don't need ai to invent ethics, only enforce the one we have arbitrarily chosen.
It reminds me a lot of the early self driving car debate where there were endless surveys asking if the car should run over the 2 old ladies or the one child studying medicine. And in the end we decided it was an unreasonable burden and just accepted that ML doesn't need to make impossible moral judgements.
Japanese viewers and their creators see the majority of anime characters as Japanese, not white. That you see them as white says more about you.
It’s no different from parental filters.