“[T]he whole idea of discrete, concrete races is bunk.” [1] I do not know of anyone who believes that human races in the sense under consideration are discrete biological groups, i.e., species in the sense of exclusive groups of interbreeding organisms which are incapable of producing fertile offspring with organisms of other groups. Certainly, the political-fantasy paradigm of racists — the dreaded Nazis (accompanied as always by sinister and mental-background music, just so you know to hate them) — didn’t believe so. I cannot recall that anyone in the present era has taken human races to be discrete species. [2] I cannot therefore imagine of what use the debunking of the idea would serve, except to insinuate that there is no biological reality to races as intra-specific subgroups, the denial of which is a curious and recent phenomenon — some might say a politically-inspired and -useful delusion — strangely applicable to only one species.
[1] Sarah Ditum, in the commentary to her own “How Churnalists Become Friends to the BNP”, Liberal Conspiracy (weblog), 27th May 2009.
[1] Sarah Ditum, in the commentary to her own “How Churnalists Become Friends to the BNP”, Liberal Conspiracy (weblog), 27th May 2009.
[2] Charles Darwin presents a treatment of the matter in Chapter VIII of The Descent of Man; and Selection in Relation to Sex, Vol. I. (London: John Murray, 1871).