do you think that when an army wages war a single man will run at an enemy nation while naked?  how does an army operate? does it not have a hierarchy? composed of educated upper class individuals and lower class plebs? multiple think tanks? factories? logistics? communication networks? a shared identity? benefits and wages?  this is about ethnic identity and ideology/religion. violence on the national scale is the final end result in the clash of competing organisations. organisations that require: an intellectual leadership(representation), a mass following, an identity, a moral framework and a communication system. all of this requires talking, reading and writing. it requires communication and the transmission of ideas and concepts. an ethnic/tribal identity is required to form a group, an intellectual core is required to represent this group based on a moral framework(religion/ideology) that acts in the interests of this group. 99.999% of actions preceding violence even to defend against a genocide are related to communication. words.
United Kingdom