There are many westerners who complain about Japanese action of chosing Asian cast for the Shingeki No Kyojin live action, those westerners are claiming that the characters from Shingeki No Kyojin are based on westerners. Of course their claim are nonsense because no matter what hair colors, eyes colors, story setting, etc of the Anime characters their facial & body form are still based on Asians facial & body form which still made them as Asian characters.
Just because the story setting of Shingeki No Kyojin are set in the west, do the characters facial & body form changes from almond shaped eyes, small nose, round face, sharp jaw and smallish body form [ Asians facial & body form ] into deep set eyes, long nose, square face, square jaw and big wide body form [ westerners facial & body form ]? Obviously no, the Shingeki No Kyojin characters facial & body from are still look the same as other Anime characters from other Anime, so Japanese did the right thing of chosing Asian cast for the Shingeki No Kyojin live action. What Japanese doing is just like what described in here http://antiwc.net/group/viewtopic.php?f=17&t=3069