Except that, as far as we know, this doesn't even take place in the USA. For all we know it could take place in some other country that is partnered or managed by both the US and Japanese governments.
Besides it symbolizes more the fact that Hiro is half and half. If there are some people out there that are still annoyed at white-washing, half Japanese is better than 100% Caucasian. Plus at the very least they got a VA who is also half and half.
Just count your blessings instead of complaining and dooming the whole thing, is all I'm saying.