Rokeach’s dogmatism scale failed to measure belief systems independent of ideology

Evidence

Much more troubling, Rokeach’s own experiments raised large doubts that he had succeeded in his primary goal of measuring belief systems independent of ideology. … Rokeach expected that ardent leftwingers would score just as high on the D Scale as ardent right-wingers. But they did not; D Scale scores almost always correlated better with right-wing Opinionation scores (p. 124). — Bob Altemeyer, The Authoritarian Specter, 2560