I really love how some people thought there was going to be a personal conflict between Frieren and Aura, but in the end it was just a quick fight.
I think people are too used to shonen fights where in the end the MC and the current rival / villain / antagonist get into some moral / ideal fight to know which one is right and which one deserves to win.
But this manga goes straight to the point, there was no moral conflict during this "vs Aura and co." arc, only the hero party against the demons. Every time the manga explained how the demons / Frieren acted it was only to show the difference between them, not to see which one is correct. In the end, this manga is about Frieren trying to understand humans, not to change her view of demons.
PD: I love how Frieren didnt even saw how Aura killed herself, when she made the order she was already facing the other way lmao