What are the primary reasons Chapter 4 of Sai Satcharitra gives for why saints like Sai Baba incarnate on Earth?

According to Chapter 4 of the Sai Satcharitra, saints incarnate during times of significant societal and religious decay. This happens when people lose respect for religion, social order breaks down, and individuals pursue only worldly happiness, ignoring their ultimate spiritual well-being. The text explains that saints descend to this earth to protect the humble, poor, and weak, destroy irreligion, and reawaken faith. Their incarnation is described as being purely for the sake of others, with no self-interest involved, aiming to uplift the distressed and restore righteousness.