I remember a documentary on politics and music a decade ago, which saw the change (in the US at least) at a very specific point: the success of the more private-personal songs of The Carpenters, from May 1970, just after the Kent State shootings. (The argument was more detailed than that, mentioning a lot of parallel processes, but this stuck in me.) This giving-up however was not in victory, but defeat: failure to stop the Vietnam War, and the winding down of the spirit of 1968.

_{*Lunatic*, n.
One whose delusions are out of fashion.}