Bloom correlated the origin of wave of dunces arriving at college (and currently leading the country astray) with the Summer of Love in the 1960s.
I read it a long time ago and loved it, though wasn't at all sure how true its account was. Wasn't there a lot about how Nietzsche had taken over the USA and was just the air we breathe? - e.g. our talk of "values" and "lifestyle", key Nietzschean terms. I learned elsewhere how much Nietzsche got from Emerson, and how much Emerson in turn had got from Germans. A convoluted story! Also, the philosopher of the Summer of Love was German—Marcuse, from the Frankfurt School.
But the described language change correlates with 80's Reaganism rather then late-60s summer of love and counterculture. So I guess Blooms correlation have been falsified?