There’s nothing like a little violence to focus the mind. I am the Middlebury College professor who ended up with whiplash and a concussion for having the audacity to engage with the ideas of Charles Murray, a scholar at the American Enterprise Institute. Though he is someone with whom I disagree, I welcomed the opportunity to moderate a talk with him on campus on March 2 because several of my students asked me to do so. They know I am a Democrat, but the college courses I teach are nonpartisan. As I wrote on Facebook immediately after the incident, this...