Who is at fault when a daughter of umofia was murdered in things fall apart?

The daughter of Umofia who was murdered in "Things Fall Apart" was killed by the villagers of Mbaino as a form of retribution for the murder of a woman from their village. This cycle of violence was initiated by the killing of the Mbaino woman by Umuofia's son to avenge the dishonoring of Umuofia territory. So, both villages share responsibility for the act of violence.