Segregation and belief polarization as boundary conditions for when fusion leads to self-sacrifice.

Physical enclavement, away from out-group members, may determine when identify fusion leads to self-sacrifice. When people surround themselves with ideologically similar others, their attitudes may polarize and become moralized, leading to more violence and hostility toward people who do not share those attitudes. We discuss how this segregation may increase the amount of political violence in typically nonviolent systems.