@kissane
If I were to extend this metaphor slightly, I'd say that the plate tectonics driving this earthquake is yes all of the changes in the technological process of information, but more deeply the geological tensions built into the concept of the enlightenment — itself a thing constructed from the rubble of at least three societies and used as the bedrock on which to build modernity.
Another thread here is the success of the 50s red scare and cointel-pro at suppressing the practice of peer grassroots political education among the left, leaving the social counternarratives that could have stabilized some parts of the political landscape to obscurantist academic work and it's non-academic counterculture opposites.