Just as you said, from one of the reviews:
Butterfield presents a fascinating discussion of American violence. He suggests that contemporary black violence is a tradition inherited from white southern violence, theorizing that white honor, slave reputation, and black respect are codes capable of provoking violence if impugned, or even slightly stepped on. Butterfield considered closely the political, social, judicial, and racial climates influencing violence, particularly their impact on the Boskets, a black U.S. family.