I'm inclined to see this as a particular instance of a more general phenomenon, the replacement of the adult by the adolescent as the paradigm citizen.
Adolescents already know all they need to know. They are uninterested in what may have come before them and confident that it did so for naught. They see instantly into the heart of the world's problems and believe them to be simple of solution. They value sincerity, authenticity, getting real, over experience or effort. Approved attitude trumps informed opinion with them, and does so by means of social pressure rather than by, say, demonstrated efficacy. And their sense of entitlement can sometimes border on solipsism.
For some time now, and increasingly, our schooling, our politics, and our cultural life have played to the adolescent in us. Young students are encouraged to focus on their feelings and to express them in any way they find comfortable, while teachers are discouraged from correcting them. Officeholders and seekers rely on the sound bite and the scandal, not to mention their allies in the braying media, to steer or frustrate public policy. Jejune amusements are labeled "Adult." And the marketers who control our media and what passes for our national dialogue are only too happy to pander to the free-spending of any age or persuasion. It's a no-sweat world, and welcome to it.
The adolescentization of politics, begun in the 1960s, has given us the politics of gesture. A couple of years ago some 60-ish women of my acquaintance, as a protest of the Iraq war, went down to the beach and took their clothes off. This seemed to satisfy them, though as I watched the newspapers closely for days afterward I could detect no effect. We are increasingly countenancing an education of gesture, in which self-expression does not merely take precedence over but displaces that which is worth expressing; in which the tokens of achievement are wholly disconnected from achievement itself; in which teachers-in-training are being turned out of their chosen career, not on account of a subpar GPA, but because they fail to display the approved attitude toward certain issues of "social justice'; in which, to put it in plain and concrete terms, a majority of our high school graduates cannot read with comprehension the sixth-grade McGuffey Reader of yore. And do they care? lol
I think that McHenry's observations are indeed accurate.