Of all the ideas percolating on college campuses these days, the most dangerous one might be that speech is sometimes violence. We’re not talking about verbal threats of violence, which are used to coerce and intimidate, and which are illegal and not protected by the First Amendment. We’re talking about speech that is deemed by members of an identity group to be critical of the group, or speech that is otherwise upsetting to members of the group. This is the kind of speech that many students today refer to as a form of violence. If Milo Yiannopoulos speaks on the University of California, Berkeley, campus, is that an act of violence?