The F scale measured attitudes, not personality, without ever proving a link

Evidence

Another weakness of the F scale attracted much less attention at the time. Its items did not pertain to behavior as personality measures typically do, but to social attitudes and ideological beliefs. Adorno et al. (1950) seem to have assumed that these reflected an underlying personality dimension, but this was never empirically demonstrated. — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 2442

Categorization

• QUESTION: Whether ideological attitudes can validly serve as proxies for personality traits is still contested in personality psychology.