India, Aug. 2 -- Tribal instincts drive people to prioritize their own group (the "in-group") while fearing or opposing other groups (the "out-group"). In modern society, this evolutionary trait deeply impacts both public health outcomes and social harmony. Deep-seated tribalism, ethnic conflict, and intense local mistrust are severely crippling efforts to contain the 2026 Ebola outbreak in the Democratic Republic of the Congo (DRC). When health teams enter a marginalized tribe's village, residents often view them as an invading "out-group." Rumours quickly spread that health workers are local political actors trying to poison or exterminate their ethnic group under the guise of medical treatment. Tribal and community factions have active...