This game deals with a very small area of the world from what I can tell - One or two major cities and a handful of towns all in the same general area. Maybe the races just don't generally enjoy living together? They didn't seem to get along that well in D:DC after all. Rivellon doesn't seem like its nations are great melting pots of social justice and equality, so I'm not really surprised by the all-human with a few other races aspect.
