Here’s a much more valid and informative comment by another of Kirn’s discussers.
Polarization is bad now but it was worse in the early 70s. At that time there was a full-on violent left wing insurgency underway. Thousands of bombings by people who believed they were the vanguards of a communist revolution. Then it ended & down the memory hole it went.
I hadn’t thought about the sudden end before!
I was a small part of that insurgency, and I understood at the time that we were working for DNC and against Nixon. The antiwar movement was growing spontaneously during LBJ, but it didn’t have media and political fuel until Nixon was elected. The movement closed down when Nixon was gone, exactly as the 2020 riots closed down when Trump was gone.