Rachel Kaadzi Ghansah is an essayist. Her latest piece is “A Most American Terrorist: The Making of Dylann Roof.”

“I remember feeling like ‘you’re playing chess with evil, and you gotta win.’ Because this is the most terrible thing I’d ever seen. And I was so mad. I still get so mad. Words aren’t enough. I’m angry about it. I can’t do anything to Dylann Roof, physically, so this is what I could do.”

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