The Kingdom looks down on humanity for its weaknesses, including its weakness to sicknesses of all kinds, but it also respects those who nurse and tend the ill. The general belief is that humans are at their best when caring for each other properly. It also thinks we're at our best when trying to investigate and cure diseases.
Witches and wizards will sometimes curse someone with an Earth based illness but this is usually done when they want to discipline one of their followers who have stepped out of line. It means the followers don't die and the suffering is deemed to be enough.