I think it had something to do with the idea that if you suggest that a higher percentage of black people come from lower socio-economic groups than white people (as the CRE does), and then suggest that people from lower socio-economic groups tend to have a higher propensity to commit illegal acts (as the CRE has), that means that you are acknowledging the BNP hypothesis of black inferiority and criminality based on skin colour, and therefore you’re a racist.

Basically along the lines of “you believe in dogs, Hitler believed in dogs, therefore you are responsible for the deaths of 6 million Jews”. Perfect logic.