RICH LOWRY: Do Not Fear The Chalk.

Rarely before have a few scribblings been so traumatizing — and written not even in ink or paint or some other difficult-to-remove substance, but in the same chalk used to mark out hopscotch courts and write temporary promotional messages about sorority mixers and student theatrical productions. That chalk messages can be considered tantamount to a physical threat captures the crisis of free speech on campus perfectly.

What has become known on social media as “the chalkening” demonstrates how some college kids can’t be exposed to the simplest expression of support for a major presidential candidate without wanting to scurry to the nearest safe space. By this standard, a “Make America Great Again” hat is a hate crime waiting to happen. It’s not clear how any of these students can turn on cable TV or look at the polls for the Republican nomination these days without being triggered. Pro-Trump chalking took off after the reaction at Emory University, where some students were reduced to tears by the messages and said they felt “fear.” Protesters gathered at an administration building and let loose the antiphonal chant “You are not listening! Come speak to us, we are in pain!” This might have been an appropriate response if the kids had been tear-gassed, rather than seeing a positive phrase about a candidate that is supported by some significant plurality of the American public. . . .

The reaction to the chalkening is a testament to the electric charge surrounding Trump. He is like the Washington Redskins of political candidates — so politically incorrect that some people can’t bear to see or hear his name. (The New York Times columnist Charles Blow actually refuses to use it.) This branding isn’t prudent positioning for a general election, but it makes Trump a perfect vehicle for provoking the other side, and it’s in that thumb-in-the-eye spirit that the Trump chalking is spreading. The students getting the vapors over it don’t understand free expression or what it means to live in a free society, where you inevitably encounter people who have ideas and support candidates that you oppose. They hate Donald Trump. Fine. That is reason to argue and agitate against him, not to seek protection from any contact with supporters of his, no matter how tenuous.

The thing is, they’ve been taught the opposite since Kindergarten.