If a TV series were filmed in Chicago or LA, the characters would likely be either white or black because of the geographical location.  Likewise, Hawaii is predominantly Asians and Polynesians and why not have them play the role in Hawaii-5-0....making it more realistic.  As an example, doing away with the African American who played the role as the governor of Hawaii was justified and has there really been a star African American in law enforcement in Hawaii?  Don't even go there as I being racist...just stating the facts about people playing the characters on a series filmed in and about Hawaii.