Garrison claimed. “Nothing has been left undone to cripple their intellects, darken their minds, debase their moral nature, obliterate all traces of their relationship to mankind.” Though starting at different places and taking different conceptual routes, Garrison kept arriving in the same racist place as his enslaving enemies—subhuman Black inferiority.
I wish I could ask the author a question. Because it seems to me that both Garrison and Douglas are not so much saying that Blacks are inferior, but the condition they are in forces them into those positions. For example Douglas talks about the way that slavemasters break up families and rape women makes it difficult to live within the institution of marriage and traditional sexual morality. I don't think he says that they are inferior morally, but that slavery keeps them from doing naturally human things like having families.