The Internet is outraged because a white actor was cast as one of the most iconic Japanese roles, Major from Ghost in the Shell, an anime movie that has had a big impact on modern sci fi.
https://www.buzzfeed.com/ryanhatesthis/we-need-to-talk-about-ghost-in-the-shell#.lbvveo769
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If it's Hermione, than sure, because she started as a book character who could be adapted to any race. That's actually a pretty cool concept, that no two hermiones are exactly alike. For this, well, it's dumb. Plenty of good Asian actors out there, the character started out as Asian, IIRC, and i don't see a need to change it. Same for white characters played by other racial actors.