The issue is that they are causing real harm by expressing those views. I know that there are people out there who hate me just because I exist and I know that will never change. While their words do not directly hurt me, they have the capability to incite physical violence against me which definitely can hurt me. It is not just me I worry about. My heart breaks for the victims of hate speech. People kill themselves because of it. People get murdered because of it. That is why it needs to be illegal.