People feel emotional distress over harms to others merely sharing one salient group membership

Evidence

Participants read about an event that harmed another person with whom they shared one group membership (a fellow psychology student) but differed on another (a student at a rival university). Only when a subtle manipulation made their common group membership with the victim salient did participants experience anger and unhappiness, reactions based on the collective self (group membership) shared with the victim. — , Rudman, Laurie A - On the Nature of…, 2266

Categorization

• XREF: Connects to the reader’s interests in group psychology and identity-based conflict — the minimal-group paradigm lineage from Tajfel. — connects to: Shared danger makes people feel close to strangers and motivates mutual help. — John Drury, The role of social identity processes…, 74; Collectively experienced trauma makes victims identify as one group, motivating help — John Drury, The role of social identity processes…, 99