Because junk like that is still believed by neo-nazis, white supremacists, KKK etc. So it is still relevant. Wiki.
White supremacy or
white supremacism is the
racist belief that
white people are superior to people of other
races and therefore should be dominant over them. White supremacy has roots in the now-discredited doctrine of
scientific racism and often relies on
pseudoscientific arguments. Like most similar movements such as
neo-Nazism, white supremacists typically oppose members of other races as well as
Jews.
Scientific racism employs
anthropology (notably
physical anthropology),
anthropometry,
craniometry, and other disciplines or pseudo-disciplines, in proposing anthropological
typologies supporting the
classification of human populations into physically discrete human races, that might be asserted to be superior or inferior.