This passage shook me up, bravo to the author:
…although nonviolence was crucial to the gains made by the freedom struggle of the 1950s and 1960s, those gains could not have been achieved without the complementary and still underappreciated practice of armed self-defense. The claim that armed self-defense was a necessary aspect of the civil rights movement is still controversial. However, wielding weapons, especially firearms, let both participants in nonviolent struggle and their sympathizers protect themselves and others under terrorist attack for their civil rights activities. This willingness to use deadly force ensured the survival not only of countless brave men and women but also of the freedom struggle itself.
That is from the recent book This Nonviolent Stuff’ll Get You Killed: How Guns Made the Civil Rights Movement Possible, by Charles E. Cobb, Jr. Also related is the 1962 book Negroes with Guns, by Robert F. Williams, Martin Luther King, Jr. and Truman Nelson, about the use of guns for protection against the Ku Klux Klan. Martin Luther King of course did keep a gun in the house, and he relied on neighbors who, at times, protected his house by carrying guns.