Allport’s theory breadth let generations of researchers mine his ideas for divergent claims

Evidence

Allport did not advocate a single pet theory of prejudice but chose instead to identify and illustrate a variety of perspectives, ranging from macro, or social-structural causes, to micro, or individual causes. He included provocative examples that, even when he chose not to interpret them in depth, could be used and exploited by others. In short, he was a synthetic and generous thinker. — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 98

Categorization

• XREF: Explains why the vault already holds contested and mutually inconsistent Allport-origin claims across the Islamophobia and antisemitism clusters — his synthetic breadth seeded the contradictions.
• corroborated: 2 independent passages support this claim — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice: Fifty Years…, 98