Garrett G. Fagan

“A final form of intra-societal violence that is very significant is the collective killing of one male by the other males of the group. The rationale for such killings seems to be that the male singled out for killing has become so violent and dangerous that he must be eliminated in order to protect the group from further episodes of unnecessary intra-group violence or dominating behaviour. As far as one can tell, such individuals are typically very good warriors. They seem to authenticate their value to the community by displaying their fighting ability. They bully and injure or kill other males in the group, they likely access other men’s women (although that is likely played down in the accounts of such incidents to the recorders), and their behaviour is so intolerable that they become more dangerous to the community than their value as a good warrior warrants. Because they are dangerous, killing them needs to be done carefully. Moreover, if not done properly, their relatives may feel it was unjust and seek revenge. In some cases, the community instructs the individual’s close relatives to kill him in order to eliminate any basis for revenge. In others, it is a community act. There is one account given to me directly by a Yanomamo tribesman visiting the United States of a Yanomamo dangerous warrior who, it is decided, must be killed. He is tricked into climbing a tree, and by necessity leaves his weapons behind. As he climbs down, weaponless, he is beset by all the males and killed."

(Steven Leblanc)”
― Garrett G. Fagan, The Cambridge World History of Violence