People attribute uniquely human emotions only to their own group

Evidence

For instance, ‘infra-humanization’ theory adopts a universalistic notion of ‘being human’ that emphasizes the role of essentially human attributes. One of the key insights of infra-humanization theory is the observation that each group member perceives his or her group as more ‘human’ than other groups. People tend to attribute secondary (uniquely human) emotions to their in-group and primary emotions to out-group members (Leyens et al ., 2000 ). — Cristian Tileagă, The Nature of Prejudice, 641