These attitudes are being made plain nearly every week on one college campus or another.

There are speakers being shouted down by organized claques of hecklers — such was the experience of Israeli ambassador Michael Oren at the University of California, Irvine. Or speakers who require hundreds of thousands of dollars of security measures in order to appear on campus — such was the experience of conservative pundit Ben Shapiro earlier this month at Berkeley. Or speakers who are physically barred from reaching the auditorium — that’s what happened to Heather MacDonald at Claremont McKenna College in April. Or teachers who are humiliated by their students and hounded from their positions for allegedly hurting students’ feelings — that’s what happened to Erika and Nicholas Christakis of Yale.

And there is violence. Listen to a description from Middlebury College professor Allison Stanger of what happened when she moderated a conversation with the libertarian scholar Charles Murray in March:

The protesters succeeded in shutting down the lecture. We were forced to move to another site and broadcast our discussion via live stream, while activists who had figured out where we were banged on the windows and set off fire alarms. Afterward, as Dr. Murray and I left the building . . . a mob charged us. Most of the hatred was focused on Dr. Murray, but when I took his right arm to shield him and to make sure we stayed together, the crowd turned on me. Someone pulled my hair, while others were shoving me. I feared for my life. Once we got into the car, protesters climbed on it, hitting the windows and rocking the vehicle whenever we stopped to avoid harming them. I am still wearing a neck brace, and spent a week in a dark room to recover from a concussion caused by the whiplash.

Middlebury is one of the most prestigious liberal-arts colleges in the United States, with an acceptance rate of just 16 percent and tuition fees of nearly $50,000 a year. How does an elite institution become a factory for junior totalitarians, so full of their own certitudes that they could indulge their taste for bullying and violence?

There’s no one answer. What’s clear is that the mis-education begins early. I was raised on the old-fashioned view that sticks and stones could break my bones but words would never hurt me. But today there’s a belief that since words can cause stress, and stress can have physiological effects, stressful words are tantamount to a form of violence. This is the age of protected feelings purchased at the cost of permanent infantilization.

The mis-education continues in grade school. As the Brookings findings indicate, younger Americans seem to have no grasp of what our First Amendment says, much less of the kind of speech it protects. This is a testimony to the collapse of civics education in the United States, creating the conditions that make young people uniquely susceptible to demagogy of the left- or right-wing varieties.

Then we get to college, where the dominant mode of politics is identity politics, and in which the primary test of an argument isn’t the quality of the thinking but the cultural, racial, or sexual standing of the person making it. As a woman of color I think X. As a gay man I think Y. As a person of privilege I apologize for Z. This is the baroque way Americans often speak these days. It is a way of replacing individual thought — with all the effort that actual thinking requires — with social identification — with all the attitude that attitudinizing requires.

In recent years, identity politics have become the moated castles from which we safeguard our feelings from hurt and our opinions from challenge. It is our “safe space.” But it is a safe space of a uniquely pernicious kind — a safe space from thought, rather than a safe space for thought, to borrow a line I recently heard from Salman Rushdie.

Another consequence of identity politics is that it has made the distance between making an argument and causing offense terrifyingly short. Any argument that can be cast as insensitive or offensive to a given group of people isn’t treated as being merely wrong. Instead it is seen as immoral, and therefore unworthy of discussion or rebuttal.