Yes, those innocent people are why I don't normally support the death penalty...but Dylann Roof is unquestionably guilty. He admitted it, freely. Bragged about it even. Showed absolutely no remorse. That is why I can understand why some people set aside their normal objections to the Death Penalty in this case.
But I still don't support the Death Penalty in this case...because every time one of his appeals approaches we're going to get more coverage of this sick little fucker. I'd rather they, in the words of Amanda Waller, Toss him in a hole and throw away the hole. No possibility of parole. He can die in prison.