Sally Kohn: Free speech became associated with the right wing and a very conservative extreme faction of the right wing. She says her students think of Milo Yiannopoulos as trolls who cloaked themselves in the mantle of free expression. "I've had this conversation with my students many times, it's like, well, viewpoint diversity, why do we need Miloiannopoulos on the campus? I'm like, no, we don't," she said.