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Any use of this for coparaing generations is simply supid. There is no evidence for change.
It is equally possible that there has been _no_ change, that there has been an _improvment_ or that there has been a change for the worse.
I wouldn't be surprised if there had been an improvement in fact. I don remember anywhere's near to 1/3 of my classmates particularly changing in their thinking from freshman year to senior year.
Unless students have improved in the last 60 years, this study has considerably overestimated the present.
I still simply cannot under stand why anyone finds this study in the least interesting.
Carrol