The reason the student protests of the 1960s didn't lead to political correctness was precisely that — they were student movements. They didn't have any real power.
I don't know what Graham thinks 'political correctness' would have looked like in the 1960s – most Americans still thought women's lib was a joke, many Americans were fighting to preserve segregation, and nobody had heard of such a thing as a gay rights movement.There's a big difference between these two things
* Berkeley's Free Speech Movement: https://qr.ae/pYCVXO
* "Free speech is a disease and we are the cure", from the sidebar of /r/ShitRedditSays: https://www.reddit.com/r/ShitRedditSays/