It was like how there'd be shadows in a place where there'd be light. In any world, where there was light, there'd definitely be a lot of dark existences as well.
In Middle-Earth Nine Provinces, there was the Saint Gate who managed all the great teachers in the world, setting ethics and rules, determining the standards for actions, and punishing crimes as well as evil deeds. It could be said that the Saint Gate determined what a great teacher was.
Great teachers would commit mistakes as well. After committing mistakes, they'd naturally be left to the Saint Gate to judge the matter.
Some great teachers showed behavior that brought shame to their title. However, they didn't wish to receive punishment and thus escaped.
The others liked freedom and didn't wish to be regulated by the Saint Gate. They felt that the Saint Gate was too meddlesome.
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