Ricky_Bobby: The alternative is what, a Chinese (-American) actress famous in the West ? Michelle Yeoh, Ming-Na, Lucy Liu, Zhang Ziyi ?
Somehow I don't think picking a Chinese actress would sit better with the Japanese, I still remember the
Geisha controversy.
No, the alternative is to cast an american actress of japanese descent.
Then you say "how many well-known american actresses of japanese descent are there?" and that's exactly the point. If a part originally meant for a certain ethnicity is recast with a white actor because there are no famous actors of that ethnicity, then how will there
ever be famous actors of that ethnicity if all the parts they'd be eligible for always go to white actors instead?
Whitewashing is a vicious cycle. They could've broken it, but they didn't.