Scientific racism as you have just espoused is probably the root of the issue. The American Anthropological Association actually released a statement in 1998 that species between human beings do not exist. The UN also released this same information in 1950 covered by the New York Times . Scientific racism persists because people refuse to keep up with current scientific findings. Hopefully this trend will not continue and you will choose to stop finding reasons to justify the illogical actions that accompany the belief in species( races) also known as racism.