I’d add “Covid” to the hypotheses. At the time it was difficult to sustain many varieties of coordinated grassroots activity, even something as banal as a book club, just because you didn’t want to meet indoors in groups and because alternatives like Zoom were off-putting to some and suboptimal in many ways. People may have relished the opportunity to come out in the streets and protest a bit, or to engage in social media histrionics, but to sustain this sort of activism in a meaningful way requires the sort of organizing and group deliberation that was unusually difficult at that time.
I’d add “Covid” to the hypotheses. At the time it was difficult to sustain many varieties of coordinated grassroots activity, even something as banal as a book club, just because you didn’t want to meet indoors in groups and because alternatives like Zoom were off-putting to some and suboptimal in many ways. People may have relished the opportunity to come out in the streets and protest a bit, or to engage in social media histrionics, but to sustain this sort of activism in a meaningful way requires the sort of organizing and group deliberation that was unusually difficult at that time.