It also includes some very banal scientific racism which could, in slightly fancier language, have been written by Nicholas Wade or Charles Murray. Roof wrote:
Anyone who thinks that White and black people look as different as we do on the outside, but are somehow magically the same on the inside, is delusional. How could our faces, skin, hair, and body structure all be different, but our brains be exactly the same? This is the nonsense we are led to believe. Negroes have lower Iqs, lower impulse control, and higher testosterone levels in generals. These three things alone are a recipe for violent behavior. If a scientist publishes a paper on the differences between the races in Western Europe or Americans, he can expect to lose his job.
With regard to Roof’s first two sentences, you might compare them with Wade’s (all quotes found in my article):
It is reasonable to assume that if traits like skin color have evolved in a population, the same may be true of its social behavior, and hence the very different kinds of society seen in the various races and in the world’s great civilizations differ not just because of their received culture—in other words, in what is learned from birth—but also because of variations in the social behavior of their members, carried down in their genes.
On the second point — IQ, impulse control, and testosterone in Blacks — Roof is also in line with Wade. Wade inflates the weak case that the (rare) MAO-A “warrior gene” makes Blacks more violent than Whites, genetically. And then on the question of violence and impulse control, Wade explains that Africa remains poor because it is genetically stuck in tribalism (read: poor impulse control) despite the awesome helpfulness of the colonial powers on that continent (“Tribal behavior is more deeply ingrained than mere cultural prescriptions. Its longevity and stability point strongly to a genetic basis”). And also violent, as the higher-than-average homicide rate in Africa represents “a difference that does not prove but surely allows room for a genetic contribution to greater violence in the less developed world.”
On the claim of a forced silence about these (supposed) truths among the scientific community, Murray and Wade also are in agreement with Roof. This is a major theme for Wade. Instead of “expect to lose his job,” Murray says a scientist who focuses on the genetics of racial difference will face “professional isolation and stigma.” The point is the same.
Given the closeness of his statements to their ideas, I think it would be helpful for Wade and Murray to explain how Roof is or is not accurate, and then explicitly denounce Roof’s associated actions. Of course Wade and Murray would never countenance racial murder of the kind perpetrated by Roof, and I would never put them in the same category — except insofar as their ideas are in fact similar. I would hate for Roof’s white supremacist friends to read the silence from Wade and Murray as endorsement of his view of racial genetics and its use as a rationale for violence.