1. I don't take longjon very seriously. I don't think you should either. I think he is interesting only as a counter-point to Izzy's bellicose form of political absolutism.
2. You are correct that counter-culture isn't exclusively liberal. You are correct that there are historical examples of similar trends that were targeting liberal beliefs.
3. In 2021, the most damaging examples of cancel culture are where people from the political left are censoring ideas they don't like. The people being targeted are people JK Rawlings, and James Damore who question liberal ideas on race and gender.
I am more than willing to criticize the extremism of the political right, and there are a number of ways that the right-wing is acting in 2021 that is damaging to society.
However, in the specific topic of cancel culture
, it is the left that is doing the most of the canceling. When comedians and public speakers talk about not being willing to perform on college campuses because of the outrage mobs, it isn't the right they are talking about.