Infamous moments where a heroic figure violated the Geneva Convention

Basically what I mean is when a heroic person in a TV show or movie is supposed to do good deeds for their town as what ends up happening is that their actions end up causing harm to their town.

To help provide an example, I will say Star Butterfly from Star VS the Forces of Evil as I won’t say too much for those who didn’t see the show, but let’s just say her actions towards the end of the show were not exactly too pleasant.