The author here is trying to make an analogy of firearms to speech. He points out that you may not use words to incite violence and suggests that the same principle applies to firearms. That, of course, is true. However, his analogy makes no sense. It makes no sense because the firearms is not analogous to the act of misusing words; firearms are analogous to the words themselves. Words are the tools of the First Amendment, while firearms are the tools of the Second Amendment. There are laws against the misuse of words and the misuse of firearms as there should be. There are no laws against words, and there should not be; nor should there be laws against firearms.