Why is Okonkwo to blame for his own downfall?

For all of his desire to be strong, Okonkwo is haunted by fear. He is profoundly afraid of failure, and he is afraid of being considered weak. This fear drives him to rashness, and in the end contributes to his death.

Masculinity is also one of Okonkwo's obsessions, and he defines masculinity quite narrowly. For him, any kind of tenderness is a sign of weakness and effeminacy. Male power lies in authority and brute force. But throughout the novel, we are shown men with more sophisticated understanding of masculinity. Okonkwo's harshness drives Nwoye away from the family and into the arms of the new religion.