The death sentence for Boston Marathon bomber Dzhokhar Tsarnaev may provide some kind of justice for the families of the four people that he and his older brother Tamerlan murdered, as well as the 16 victims who lost limbs in the bombings. But the decision gets us no closer to the big question: Why do this? Why set off a bomb that kills Martin Richard, an angelic 8-year-old boy? Or Lingzi Lu, 23, a graduate student in mathematics from China?
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