"Surely no one is outside halone's grace?"
The 60 and 63 dark knight quest touches on aspects of forgiveness. Basically people who have been former enemies, or may have known former enemies by association.
The urge to twist the knife, to kick people while they are down, to shun and shoo away, is real. It is a problem victory often does not cure so much as "spread it around". I think that may be a theme in Stormblood, and how its effects reach far more than what seemed like "an acceptable target".
I haven't done the other quests yet, but it kinda made me wonder about what people, given the chance, would do to "the deserving.", and how it doesn't always come from the top.