Jonathan Haidt and Greg Lukianoff in Persuasion:
As probably will surprise no one, the polarization spiral between the left and the right has only gotten more intense in the last three years. Most alarming is the growing acceptance of political violence as a justifiable method for achieving political goals. A survey in 2019 found that approximately one-fifth of partisans in both parties believed that violence against the opposing party would be at least “a little” justified if their party lost the 2020 election. Between 2020 and 2021 the share of students surveyed who said violent protest was “never acceptable” dropped from 82% to 76% and at most elite schools it was even lower.
We now know a lot more about the polarization spiral and who is driving it.