I still see some people butthurt from things that the manga don't even say. The manga hasn't described demons as "evil" but as "wild beasts" in the same sense as any other "natural predator". As far as we know Demons had developed the ability to use words almost at the same level as Humans, NOT because they understand humans, but because they learnt that using words they can decieve humans. They dont hold familiar bonds BUT are aware of terms like "mother, father, son" and use it to decieve humans (like how the little demon girl used "mother" to make the townsfolk have pity of her or how Lugner used "father" to mimic Granat's desire of avenge for his son) YET they seem to have hierarchy bonds based on POWER (Political or Combat? We still dont known, but it seems to refer to "combat power"). It seems that Author-san is still playing the usual story of "demons are hunting humans" and people are mad because of that, this was never meant to be a revolutionary story that changes how usual "hero party vs demon lord" stories go, but to tell the story in the perspective of a inhuman being that failed to understand humans and by her own desire is trying to understand them, We have seen humans, dragons, demons, dwarves, its all just playing in the same sense of a usual fantasy adventure, but all in the perspective of someone trying, again, TRYING, to understand humans.
Ofc if you see a problem with it, then just pretend that anything about this is happening, but I really fail to see why people have a problem with the way the story is portraying demons. They aren't humans, the manga hasn't addressed them as evil, but obviously since they are NOT humans they are gonna clash with them and there is nothing wrong with it. We are talking about an elf that is trying to understand humans and have already dealt with the demon lord (and basing on how she talked about demons back in chapter 14 we can assume that she had dealt with demons for a LONG time, and she is just acting as how she knows that demons will act). This manga is not even trying to make Freiren suddenly understand humans, but at least try to learn about them, then in the chapter about the new year anniversary you all expected Frieren to suddenly go a enjoy the anniversary because "oh, wow, such a beautiful view, surely Humans are something else"? Nope, at the end she didn't understand anything about it, and she didn't find any value in the festival or the sunrise, but she smiled cuz someone "close" to her smiled as well Yet I didnt see anyone complaining about it, the "inhuman elf girl" kept behaving as an inhuman elf girl yet we learn a bit more about how she bonds with humans. But now that we are slowly learning that Demons here are not just "Saturday morning villains" but they are an inhuman race that predates and clash with humans you all feel troubled about it.
As I said, this is not a battle between "evil" vs "good" but between "humans" and a race that its definitely NOT human and that was designed by the author to decieve humans in a way that they use daily, with words. A few comments ago I made a similar comment, but I will repeat myself, we DONT know where this is all going to, we DONT know how is this gonna affect Freiren, Fern or even Stark! I didn't see you all making this fuss when Qual the evil demon sorcerer literally tried to avenge his lord and, well, acted like a demon even when he understood that the war ended and that there wasn't anything else to fight for, or when the solar dragon acted just like an animal and nothing more, but you all are making a fuss over the humanoid demons that predate on humans. Just fucking calm down and wait to see where this is all coming to. Right now this is a good story, a very unusual one, its slow and its nostalgic, yet you are all worrying about the "evil beings that torment humans for whatever reason" just sit down, read and pay attention, once this arc ends you all can fuss as much as you want. Im sure that the main reason you all act like this is because we still dont know a solid reason for demons to predate on humans (even if you all where silent when Qual acted as any other manga devil demon)