While I don’t typically support the death penalty, given how it is usually done, and several other aspects of the legal proceedings and associated biases… in this case, I’m making an exception, due to the utterly unambiguous nature of both the crime and the (AFAIC) incurable hate present within Roof.
Or, to paraphrase my former mentor, “A monster like that needs to stop breathing my oxygen”.
But, then again, I’m coming from a background where I was raised as thinking of the Nuremberg trials and the associated executions as being one of the only positive outcomes from the Holocaust, so I recognize that intrinsic bias there. If I was on the jury, I’d try to get myself recused because I know that I would be informed by that bias.