"Should it be the state or feds (or both!?!) that capitally prosecute racist mass murderer Dylann Storm Roof?"

As I noted in reply, I think not. Also, the governor and former governor wants to make this about a lone deranged hateful person. "Absolutely" (as multiple victims already are talking forgiveness; this might not necessarily imply they are against executing him, but inclined to think so) not. Jon Stewart might be right to think "here we go again" -- latest horror, then we forget, until we are horrified again. Without doing anything to change things.