A
ton of weird stuff from that time seems to run through Esalen. I will read this or that history of computing/hippies/etc and boom, Esalen.
Strange how influence works.
Anyway, beyond that... this is something I've been contemplating for a long time. I would actually agree with the other HN poster that New Thought was a contributing factor. I also locate part of the hyper-individualism at play today in the reaction to the Soviet Union's collectivism and Nazi Germany's mass movements. There seemed to have been a certain "inoculation" that was put in people's heads that "collaborating in large groups was e.v.i.l."; this later cropped out to Reagan's nostrum "government is the problem", along with the decline of labor, etc. The Me Decade was what, the 70s, and then on into the 80s. I recently read "We were as gods", a memoir & history about growing up in a Vermont commune in the 70s and how those communes fell apart. The author locates the major root cause (out of many factors) in the inability to form a proper governance mechanism and in the heavy "can't tell ME what to do" individualism in the movement.
So.... we have selfies, dysfunctional governments, libertarian fascism, and gig economies today. There are links here between all 4. (Although, an astute observer remarked that "self portraits" are an old tradition of painters, so it's prudent not to point a finger too, ehm, pointedly at the moderns).
Anyway, I view movements such as the DSA as a sign of a more healthy society struggling to come into being - the individual is important - but so is society and the group. N.b., this isn't particularly liberal as an idea goes - I seem to remember remarks on this from the Mass. Bay Colony chiefs, and at least one part of that concept goes back to early Christian writings.