I
https://www.scientificamerican.com/article/evolution-of-prejudice/
“Overall, the results support an evolutionary basis for prejudice. Some researchers believe prejudice is unique to humans, since it seems to depend on complex thought processes. For example, past studies have found that people are likely to display prejudice after being reminded of their
mortality, or after receiving a blow to their
self-esteem. Since only humans are capable of contemplating their deaths or their self-image, these studies reinforce the view that only humans are capable of prejudice. But the behavior of the rhesus monkeys implies that our basic tendency to see the world in terms of “us” and “them” has ancient origins.
Psychologist Catherine Cottrell at the University of Florida and her colleague Steven Neuberg at Arizona State University,
argue that human prejudice evolved as a function of group living. Joining together in groups allowed humans to gain access to resources necessary for survival including food, water, and shelter. Groups also offered numerous advantages, such as making it easier to find a mate, care for children, and receive protection from others. However, group living also made us more wary of outsiders who could potentially harm the group by spreading disease, killing or hurting individuals, or stealing precious resources. To protect ourselves, we developed ways of identifying who belongs to our group and who doesn’t. Over time, this process of quickly evaluating others might have become so streamlined that it became unconscious.”
Don’t kid yourself ‘ro. Even you harbor unconscious bias.