Rokeach’s own data contradict his claim that right-wingers are more dogmatic

Evidence

Furthermore, the conclusion about which extreme on the political scene marches to the more dogmatic drum was contradicted by data Rokeach himself collected in England from 135 students representing the spectrum from Communists to Conservatives. The former scored a little higher than the latter; but none of the differences among the five parties represented in the sample attained statistical significance (p. 114). — Bob Altemeyer, The Authoritarian Specter, 2567