The answer lies in our evolutionary past. Humans are social animals; being rejected from our tribe or social group in our precivilized past would have meant losing access to food, protection, and mating partners, making it extremely difficult to survive. Being ostracized would have been akin to receiving a death sentence. Because the consequences of ostracism were so extreme, our brains developed an early-warning system to alert us when we were at risk for being “voted off the island”
