I don't think there is hardly any differences between races, except for culturally induced ones. To my knowledge there has been next to no huge leaps evolutionally for some 10,000 years and this is across all races. For proponents that some races are inferior I just look at the number of indigenous groups that have had members get law degrees to fight for their rights through different legal systems, and very successfully.
Mata, your use of the Harbijan 'injustice' doesn't have anything to do with race, more a case of who had more clout at the hearing.