What were the teachers of the 60s and 70s doing?
Answer: They were **willingly** supporting, upholding, and establishing a socialist-funded, single-payer, godlessly secular, compulsory-use entitlement.
I graduated high school in 1977, and I can tell you I had just as many hippy-dippy teachers then as there are now. Back then they were spouting crap about evil corporations polluting our rivers and streams, leading to the first Earth Day in 1970.
We were taught that the Earth couldn't support the coming population explosion, and did exercises that showed that even if we "discovered" another earth, geometric progression would only extend the inevitable for a very short time before we ran out of oil, food, and potable water.
And we were taught how FDR saved our country after the evil capitalist crash of 1929 with his public works programs such as the CCC and WPA.
Yeah, the liberal agenda was always in the public schools, if the details of what was being taught changed.
Oh! And....Let's not forget the emphasis on mock U.N gatherings.
They were pushing the envelope then, and my bet is that the government schools always were.
Fundamentally, modern government schooling ( since mid-1850s) was, and is now, a socialist, single-payer, compulsory-use monopoly and price-fixed cartel. NOTHING good can come from that.