I think maybe part of the puzzle is described well by Bryan Caplan:
>Who fears the left? Strangely, the main answer seems to be: leftists. I talk to a wide range of people in academia about left-wing anger and the fear it sustains. As you’d expect, the people who are most outraged by the climate of fear are non-leftists. But the people who personally experience the most fear are leftists themselves. In my private conversations, some of the most boring milquetoast technocratic leftist scholars have grimly foretold that somehow, someday, a mob of their own ideological persuasion will come for them.
https://betonit.substack.com/p/leave-anger-behind
In any case, she told me about one or two of her HS classmates who were actually serious in their use of social media, and how they were weird and almost maybe even poorly adjusted relative to the rest of the class.
Point being that even the youth culture you see online could just be the tip of the iceberg. (Or maybe my sister's peer group is unusual! Hard to say.)