But he doesnt get to leave this world knowing he is a good person. Which is the most important thing, really.
My thought is that he's got lots of years on death row to work on it. It won't undo what he's done, but if he does, the world will be better for as long as he's still in it.
I read the comments on this thread and I think about jihadists. I think about the Crusades. I think about my own parents who came from "good Midwestern values" that dictate beating one's children for their own good (truck stops in the Midwest actually sell paddles for beating children, painted with "humorous" sayings, the same paddles I grew up with -- in case correction is needed on the road and sufficient implements are not at hand).
Since the Old Testament and I'm sure longer, people have done horrific things to others because they believe it is holy, instructive, sanctioned by some higher being, and/or is for some higher good.
Really it's about having power and wanting more of it -- having power over others' bodies, their property, and their lives -- and using something deemed great and good to justify the violence and oppression that such desires spawn. Even the history of the US, which so (ostensibly) nobly began in rejection of oppression, went on to employ the propaganda of Manifest Destiny to justify and garner spirit-swelling support for violently taking everything from Native Americans and oppressing them. The Bible was used to justify slavery and segregation, and that spirit still lives on in the South; I know because I lived there. Dubya Bush claimed God told him to invade Iraq over 9/11 and non-existent weapons of mass destruction, and justified the means with the ends of killing a dictator, only to replace the oppression with more. People get fired up for a holy cause. When I was a Christian, I myself was an asshole and thought I was so right. That spirit-swelling stuff is just a distorted lens. It really fucks things up.
If I were to preach anything, it would be to learn to respect and honor all boundaries and to appreciate reciprocity. This isn't utopian peacenik shit, it's hard work that doesn't come naturally. I would preach to give others the gifts of the Buddhist Five Precepts. Again, hard work, not our natural inclinations. If I ruled the world, I wouldn't oppress, I would support, and make sure I had others around me who reminded me to keep my ego and any kind of spirit swelling out of my decisions and actions. But I don't rule the world, oppressors do. They don't want what I offer. They detest it. They detest me. And with exceedingly rare exception, this is how the world has always been. My heart has high ideals and strives to live them, but the world is ever more dystopian. It's all quite nausea-inducing, and humans have been disempowered and nauseated by the way of the world in all cultures since always. There are genuinely good people, but they are in general disempowered, forced to act against their consciences and their wills in order to survive. Suicide in response to disempowerment, violence, and oppression is also as old as those things themselves, and is, in some ways, an ultimate form of survival.
*climbs down from pulpit, starts mixing SN (because oppression says no N for me)