Because technically, as a citizen of the United States (in this case) are protected by freedom of speech rights. If you ask me what I think of my neighbor, I mi

Because technically, as a citizen of the United States (in this case) are protected by freedom of speech rights. If you ask me what I think of my neighbor, I might tell you that I think she's a whore and that she probably has syphilis. That is in no way illegal, BUT if I start a campaign to slander her name publicly, it can be taken as a deliberate attack on the victim's reputation and even then it's not so much that it's illegal, but that you caused another citizen damages from your actions. I have a right to tell the world you're a rapist, there's a freedom of speech inherent to being a US citizen which allows me to do this, but you have the right to seek damages for the troubles you're being put through.