Do I care if the Japanese, Korean and Indian film industries are ethnically diverse?
I guess the argument there is that the audiences for those industries are not as diverse as the west? If 90% of people watching Japanese cinema are Japanese, then having 90% of roles cast of Japanese isn't really a thing.
72% of the US were white in the 2010 census (87% in the 2011 UK one). Pretty sure 1 in 4 lead roles in US films are not non-white.