I see people still debating casting choices but has anyone really taken a hard look at the source material?
This is a Japan that has went though not one, but two new world wars. A nuclear World War III and conventional World War IV. The world outside GITS Japan is a dystopian mess, the United States has collapsed into three different countries including a neo-fascist state often called the American Empire that is engaged in invasions and occupations of Latin America. Then Russia and China are so bad off, they barely seem to have any major influence beyond their borders. Its mentioned in passing that Berlin was destroyed in both wars. This is a crapsack world and Japan is a like shining beacon of hope in the dark.
The Japan of GITS has millions of refugees from all over the world. There are major international anti-cyborg terrorists active in Japan. This isn't the homogenous Japan of today, but a melting pot of global cultures, ethnic groups, and transhumanism.