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I think the author views Okonkwo's fate as a natural progression for abuse of power in the Igbo culture. Okonkwo's tragedy is a complete accident. It is a moment of blind chance that drives Okonkwo from his homeland. The greatest loss is more than material: Okonkwo's faith in the power of hard work is shaken. His will and strong arm are unable to prevent this disaster. As a middle-aged man, Okonkwo is being forced to start over again.
Although the event is an accident, it should also be remembered that Ezeudu was the man who warned Okonkwo not to take hand in Ikemefuna's death. The disaster, a seeming accident, seems to confirm the fears of Obierika, who warned Okonkwo that the earth goddess did not smile on Okonkwo's participation in Ikemefuna's murder