Human or Country?

Countryhumans are almost identical to humans. The only difference being their eyes, almost immortality, and magic.
Everyone knows that countryhumans are severely allergic to lymphod berries, vines, flowers, and leaves. Everyone also knows that they'll die a slow and painful death to narphod berries, vines, flowers, and leaves.
Yet, why are mortals trying to poison their food,drinks, clothing, and many other necessities with them? Why are they actively trying to murder their own countryhumans? Most importantly, who is actively saving them and making the attempted murders known?
NOTE: This au is very different from other aus and if an au similar to this is found, it's either stolen or a coincidence.