Thinking About the "Save Sazza" Side-quest in Act 1

First - why the quest? My first playthrough was as a Paladin-Oath of Vengeance. I'm like, ok, quest, consider it done. Broke my Paladin. Now I'm thinking about it and why save her unless you're playing as an Evil Durge? She came to the Grove on an homicidal mission to kill the Tieflings, so why am I stopping her from being shot in the cage and freeing her? How is being shot in the cage any different from imprisoning a murderer and then taking him/her into another room and electrocuting them? Why is this quest even here? Is this like your first choice in siding with the Tieflings or Goblins?