John Howard Griffin said this quote

Nothing can describe the withering horror of this. You feel lost, sick at heart before such unmasked hatred, not so much because it threatens you as because it shows humans in such an inhuman light. You see a kind of insanity, something so obscene the very obscenity of it (rather than its threat) terrifies you. It was so new I could not take my eyes from the man's face. I felt like saying: What in God's name are you doing to yourself?