If the Character is Japanese, why not cast someone who is actually Asian?

I wonder how many Asian actors auditioned for the part before they decided to go with Scarlett Johansson? I can see why fans of the original Ghost in the Shell (as well as any Asian folks that were hoping to see a movie that reflects the true nature of the original anime) are furious. Us minorities are tired of being erased from our own stories, Hollywood. It's time to do better, Paramount Pictures.

‘Whitewashing’ row over Scarlett Johansson's Ghost in the Shell role reignites - theguardian.com