Because people don't want to face the reality that they have sinned, and they find it impossible either to forgive themselves or to face others who learn about it.

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Porque no deciden ser mejores personas a través del arrepentimiento genuino, clamando a Dios Todopoderoso; el perdón de sus pecados.

Because it is considered a defeat

Because of pride and ego.

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Generally, man does not like to have a feeling of being humbled , neither do they want to loose,hence self-defense comes in

St Dorotheus wrote, 'The reason for all disturbance is that no one finds fault with himself'.