Well, in Frieren specifically, the point is that the demons are very much not human. They are intelligent, logical, they can think, they can reason, but on a certain level there are things (most emotions, friendship, the idea of a life having inherent value) that they can never, ever understand. It's just fundamentally not possible for them. The best you will ever get out of them is a sort of mutual acknowledgement that killing you would be more trouble than it's worth or doesn't align with their goals at this particular time. And ultimately, they're predators that prey on humans. They will do things like cry for mommy or act friendly because humans drop their guard for that. They don't even understand why it works, just that it does.

There are multiple plot arcs devoted to explicitly explaining all this, and the demons repeatedly prove the truth of it with their actions. The fact that OP was able to watch Frieren and walk away with the above take is a testament to how utterly leftism eats its adherents ability to consider other worldviews. (Or, alternately, proof of how utterly unable to consider other views one must be to become a hardcore leftist. One of the two).

In short, I'm 100% sure this guy talks about the importance of media literacy.