is the world still safe for the kids?

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i have read this at time magazine about the popular crimes of the century. there was this story about a very popular man in his neighborhood, active in the church, president of an organization, and he has this craving of killing. he would hide them under his basement, throw them in the river; others even lay these corpses on their beds. what pushed these people to be like this? is the world going to be a killing field in the future?