How can you identify socially acceptable bias. For example, you’d expect it to be biased towards cars with 4 wheels vs rare 3 wheeled cars, but how does it know that bias is ok but being biased to male lawyers isn’t.
And then the billion other similar situations.
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.