OP - this was discussed EXTENSIVELY at PowerPlay's launch. If you really want to see what the whole forum thought at the time, a quick search will help.
If, after that read, you remain disappointed, then perhaps also ask why so few are women? And what about gays and lesbians - does FD have them covered? How about transgendered people? And why are all the leaders human/humanoid? Where are the little green, blue and purple "people"? And why does every one of the characters have 2 arms and legs? That's one way to look at it.
The other is to accept that this is a game, and applaud the fact that its developers were thoughtful enough to include white, black, Asian and Hispanic-looking individuals.