I'm pro-death penalty in theory but against it in practice. There's definitely some people who forfeit their right to exist with the rest of us. But we can never apply it fairly or even guarantee we aren't executing actually innocent people. And the ugliness and evil of that is more than enough to make me against capital punishment.
Om top of that, it's not fairly distributed sometimes and it's also more expensive than just life in prison. With all that, what's the purpose? It's clearly to make other people feel good, not about justice. People love revenge porn, and I think that says a lot about us as people that we're willing to deal with all the negatives to bring us joy about ending another person's life.