>create race of creatures in your setting
>creatures are wholly and unapologetically evil
>kill other living things constantly
>deceive and lie whenever it helps them
>literally incapable of understanding things like love, compassion, or mercy
>prove multiple times that they cannot be reasoned with or made to change their ways in any capacity
>there are STILL people who believe that you can be nice to them and they'll be nice to you, both in and out of universe

Why does this always happen?