Because I care deeply about everybody – no matter what they have done. Because forgiveness and love are my core values, even if it doesn't usually show up in my day to day life. Because revenge is always bad. Torturing somebody no matter their crime would go fundamentally against those few things that I feel very deeply about – not that different from loving my family or caring about the longterm wellbeing of humanity.

If that sounds irrational to you: That's because it is irrational. Whether we choose to end another persons life is fundamental in our understanding of life itself, which is highly subjective.

But your belief that we should kill other humans is also irrational and subjective.

Edit: Also this paragraph in your first answer

>> I also think that pain should be part of the death penalty... that a murderer doesn’t deserve a quick and painless death but rather a healthy period of searing agony to experience the anguish that they themselves wrought on another."

is actually terrifying to me. Even reading it causes me some physical discomfort.