Why does nature do evil, such as a river flooding?

According to Osho, nature does nothing 'evil'; it is amoral causality. The same forces that ripen wheat also flood fields; fire cooks and burns. Benefit and harm arise together—remove the cause and both vanish. Calling floods 'evil' reflects our self-centered clinging, especially to life. Maturity means accepting the whole: birth with death, gain with loss.