Conservative White Christian Hate Criminal and Mass Shooter Dylann Roof is an interesting case for a discussion of the death penalty.
It does indeed. Good point.
An asshole arms up, barges into a church, starts picking people off, intentionally lets one or two live specifically so they can relate what they witnessed, and then fully admits to it. No question he did the deed. The question of executing someone who might be innocent doesn't apply.
Now the remaining question becomes -- does the State have the right to take a life. I say no. Because no one gets that. Once you start waiving that, Pandora opens her box.