#1
Primary record
U.S. House Committee on Foreign Affairs — The Assassination of Representative Leo J. Ryan and the Jonestown, Guyana Tragedy (Staff Investigative Group report, 1979)
; FBI Jonestown recordings and Peoples Temple records; survivor testimony on coercion, resistance, information control, punished doubt, and the position of children.
Public record — no single canonical web link; verify by citation above.
#2
Primary record
Social-identity and identity-fusion research; motivated reasoning and identity-protective cognition; my-side / partisan-bias studies
— for how political identity shapes interpretation of evidence.
Public record — no single canonical web link; verify by citation above.
#3
Primary record
The illusory-truth effect; affective-polarization research; recommender-system and engagement research; outrage/moral-emotional language studies
— for repetition, division, and attention dynamics (anger as one signal, not the sole cause).
Public record — no single canonical web link; verify by citation above.
#4
Primary record
Behavioral-science literature on escalation of commitment and sunk-cost effects; cognitive dissonance and post-decision justification
— for the investment-hardens-belief argument.
Public record — no single canonical web link; verify by citation above.
#5
Primary record
Trusted-messenger / depolarization and belief-correction research; humiliation, identity-threat, and defensive-resistance studies; groupthink and dissent-sanction research
— for the "how people find their way back" section.
Public record — no single canonical web link; verify by citation above.
#6
Primary record
Campaign-finance records and representative fundraising communications from both major parties and advocacy organizations
— for the identity-expression and urgency-fundraising claims.
Public record — no single canonical web link; verify by citation above.
#7
Primary record
Historical scholarship on political division in the Civil War, segregation and civil-rights era, Vietnam, and Watergate
— treated as distinct periods of severe division, not equivalents.
Public record — no single canonical web link; verify by citation above.