I think the main point is one that I never want to admit: It's about market share.
As a non-white male gamer, I too would like to feel represented every now and again. It bothers me that the only way I can see someone who looks like me is a Nigh-psychotic (although admittedly awesome) thrashball player, or a thug homicidal maniac, or as a fat washed up football player who has to read every sign he sees out loud (USE YOUR INNER VOICE, COACH).
But in simple terms, Black, Latino, Female... we don't make up the market as white males do. Notice how I left out asian. They seem to be fine with their Caucasian representation that their own designers make them out to be, so that's good with me. Although I would love to discuss that in length one day. It weirds me out.
If you look at every developer interview, they say the same thing about their main character: "We really wanted to design a main character that the player can relate to". Notice the look of the person who's normally saying that. He's not faulty for thinking that way. Most players WOULD identify with that character because the majority of the gamers would stride to be that character as it represents what he most would like to achieve.
I don't feel that way, not being white male. A few of us like Bara_no_Hime will not want to achieve that. But we are far out stripped. As wonderful as it would be to be represented, with the high cost of games, designers and developers will not take chances and will pander to the largest market share.
Girls will be hot and big breasted, deciding a war zone is the best place to so off her mid drift and cleavage
Blacks will be loud, inhumanly muscled, and probably not really understand how to speak english.
Latinos will be limited to Dom and Alyx