Allport simultaneously held contradictory cognitive and psychodynamic theories of prejudice

Evidence

Allport is the founder of the cognitive approach to prejudice, which views stereotyping and categorization as normal and inevitable byproducts of how people think. Yet he also viewed prejudice as a fundamentally irrational hatred, born of ignorance and the ego-defensive maneuvers of people with weak personality structures. — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 99

Categorization

• XREF: Documents the two rival Allport lineages — contact/cognitive vs personality-defect — that later split the field; relevant to distinguishing which vault claims derive from which.
• corroborated: 2 independent passages support this claim — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice: Fifty Years…, 99