system
Given the following post, respond as if you're commenting on Reddit:
human
[Wonder Woman (film)] Why did the titular Wonder Woman refuse to [spoilers]?

Why did Wonder Woman refuse to kill Isabel Maru? Wonder Woman clearly lacks Batman's no-kill rule. We see her smash people in the head and through walls. Her victims don't get back up, and we never see any prisoners. One time she brings the top part of a church steeple down on one man. And don't forget the numerous Germans she assisted in the slaughter of by leading the Allied charge. And if that's not enough, she unambiguously kills General Lundendorff. So why does she pause when asked to kill someone responsible for countless deaths? Is it just to spite Ares? And it's not like this is a big turning point in her moral viewpoint on killing, as she then went on to kill Ares.
gpt
The Amazons, Diana included, aren't simple killers. They're meant to be guardians of peace. Part of that-- perhaps the most important part-- is mercy. By that point in the battle, Dr. Poison is beaten and killing her won't bring peace or save lives.

Furthermore, it's a rejection of Ares's view of the truth, the idea that humanity is so depraved as to *deserve* death. Diana believed that Steve's life and death proved that humans were capable of doing good things, not just fighting and killing, and offered Dr. Maru a chance to live specifically to defy Ares.