As one who grew up during this era (born in 1955,) I think you pretty well summed things up. I do think that in addition to the ‘free-love’ philosophy, that postmodernism caused an erosion in at least an intellectual agreement with the notion of true authority. As society became more postmodern, the mantra became, ‘If it feels good (to me,) do it.’ This has caused an erosion in sexual mores, civility, and many other areas.
I was born in 1953, so I had a front row seat!