You may already know this 2015 book (I read it recently) but the big take-home is that nonviolent protesters in the CRM were unarmed, but were often defended by armed people. Division of labor. Black Southerners used weapons defensively. MLK had a gun. Rosa Parks believed in self-defense.
This Nonviolent Stuff′ll Get You Killed: How Guns Made the Civil Rights Movement Possiblewww.dukeupress.edu