If this alien race is racist because they're all tribal, why isn't Worf a racist character when he's a warrior prone to agression?
They could have cast some white actors and darkened their skin like they do with some klingons. Then you have a racially diverse cast but you still have a light vs. dark thing. So then you need to remove the tribal aspects, or you just cannot have an entire alien race be dark skinned. I dunno.