It's easy to say "it wouldn't have to be this way" or "it wouldn't have to come to this", but when it comes down to it, it's not possible to reason with "beings" like these.

The real issue is the projection of human qualities on animals which only have some traits resembling humans.

It's subtle but those demons in the Frieren anime... they want the city to remove the barrier "for peace" but in reality they just "make sounds which imitate humans speech" in such a way that they can kill them. This is becoming more and more of a commentary on world events, but it's not the Mexicans that need to be kept out, and the barriers aren't physical walls, but mental spaces that they want to occupy.