Frames of reference govern perpetrator action
Individuals interpret situations through layered frames of reference: broad societal assumptions, the specific historical and institutional context, the immediate situation, and personal dispositions. When a society's shared frame redefines a group as a threat or problem, killing that group can appear to perpetrators as a reasonable, even necessary, response. Behavior that looks monstrous from outside becomes coherent once you reconstruct the frame from which the actor made sense of it.
