The ruling class of Nagariel has never truly considered the people at the bottom as humans; they merely see them as slaves, expendables, or even just "things"!
Killing some of the lower-class people "accidentally" doesn't weigh on their minds or become a "burden" for them.
Religion explained these issues to the populace, saying that indeed, they all carried many sins, but it doesn't matter; after death, they would descend to Hell.
In contrast, those victims, having been harmed by these "bad people" and even dying because of them, instead ascend to the Celestial Kingdom. This is not seen as sad, pitiful, or lamentable, but rather as a... grace.
At least they can go to the Celestial Kingdom, while those full of sins can only descend to Hell.
They aren't unable to distinguish right from wrong or sin; they have just grown accustomed to enduring it.
Until—
The arrival of the Federation people.
