In my opinion, Ta-Nehisi Coates is a national treasure. I think his thoughts on Dylann are right on.
“Moreover, killing Roof does absolutely nothing to ameliorate the conditions that brought him into being in the first place. The hammer of criminal justice is the preferred tool of a society that has run out of ideas. In this sense, Roof is little more than a human sacrifice to The Gods of Doing Nothing. Leave aside actual substantive policy. In a country where unapologetic slaveholders and regressive white supremacists still, at this late date, adorn our state capitals and our highest institutions of learning, it is bizarre to kill a man who acted in their spirit. And killing Roof, like the business of the capital punishment itself, ensures that innocent people will be executed. The need to extract vengeance cannot always be exact. It is all but certain that a disproportionate number of those who pay for this lack of precision will not look like Dylann Roof.”