Why did Sephiroth become evil?

Question

Sephiroth refused to kill them even after they betrayed Shinra. It was Genesis who led Sephiroth to become insane, as he became disillusioned with Shinra and fell from grace.

Hagrid P Hazard · Accepted Answer

Sephiroth refused to kill them even after they betrayed Shinra. It was Genesis who led Sephiroth to become insane, as he became disillusioned with Shinra and fell from grace.

Why did Sephiroth become evil?

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