They evolved to help us take care of the other people in our groups. But not so much people outside our groups. E. g. : a group can survive an apocalypse better that a strong lone person. We, to survive, depend on people, get along with people. The expanding circle: self-interest: i care about myself and my family. All animals have instincts for gene-preservation (with exceptions) E. g. : a salmon kills its self in order to reproduce, breath to lays eggs. E. g. : bees stink and die in order to protect the hive. Kinship, shares genetic relationship: friendship: i care for historical cooperation partners. Sharing food used to be a life-and-death matter for us. Mutual benefited relationship (reciprocal altruism: tribalism: i care about us, but not them. Evolved morals in humans took care of this. Anthropological survey shows that ethnocentrism is universal: i care about all people or creatures that can have positive or negative experiences.