If you are asking about the demons attempted genocide of the elves in the past:
light manga spoilers
No, I don’t remember any additional info about that from the manga.
If you are referring to Frieren’s ongoing attempted genocide of demons:
light manga spoilers
We meet more demons as the story continues and Frieren and co. will confront them. Philosophical discussions about the true nature of demons will be had (are they simply monsters? do they feel emotions?). Those questions might not run through Frieren’s head, but the story does a good job of making the reader ask those questions through other characters.
Traister101@lemmy.today 4 days ago
It’s not really a problem. Frierens demons are explicitly monsters, not in the typical “different species” sense. They gained human language in order to better kill humans, Himmel tries to give a “child” demon a chance and she kills a family.
I love me my “redeemable monster” types, that’s why we have stuff like Tensura and other shows where monsters are not inherently bad. In Frieren they are monsters, they exist to kill people end of story. I rather like the simplicity to be honest, it’s boring seeing Demon/Monster redemption arcs all the time.