Psycho Babble
The psycho analytic interpretations seemed simplistic and silly. I suppose to audiences back then this "trick cyclist" stuff was rather novel, but it wouldn't go down with today's audiences. Yet I don't think our understanding of human nature has advance at all since then. So why wouldn't that psycho babble be accepted today in a movie?
"Trick cyclist" was a name WW2 US servicemen gave to psychiatrists.