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What made Dylann Roof do what he did? You know, I mean, that's the question, isn't it? I don't know, there are pieces of the puzzle, and you put them all on the jigsaw board, and you're still going to have a big hole there. What I do know is that violent behavior -- whether it's serious violence or minor violence in populations -- is never just one thing. It's not a one thing problem. It's going to be an accumulation of things, kind of a whole cocktail of factors.