How did the lack of balance in Okonkwo's life cause his downfall?

Okonkwo's problem was that he was inflexible to the point of ridiculousness. He tests the limits of his society's integrity and manages to expose how the strict limits and confines were no longer useful in the changing climate of colonization. His strict adherence to the rules and traditions goes to the point of absurdity pointing out the flaws inherent in them. Okonkow's lack of balance comes from not finding that place where tradition can meet and survive and evolve with the changing times.