My moral objection to the death penalty stems from the risk of executing innocent people, which is not a factor here. Give him the meathooks!
So would you support the death penalty for instances where there was, say, video evidence of a particularly bad crime/murder? Or do you also make an exception for what we have deemed to be war crimes?
I don't think there's a legal standard we can create that is more stringent than "beyond a reasonable doubt" that would include cases with video evidence and exclude cases without it. I oppose the death penalty for this reason.
The only executions I'm willing to tolerate are those carried out against violators of human rights, who committed those violations in a context where they felt they could act with impunity and therefore felt no need to conceal their crimes. This includes dictators, but I would also include slaveowners after the Civil War in this category. There's no credible dispute as to their guilt because when they did what they did, they considered it legal.