Technically, it's not a disorder or diagnosis, but it is generally thought of to include a syndrome of sorts with a range of symptoms and comorbide disorders that develop what is generally called a psychopath. And I don't really believe in evil. It's nothing more than a convenient word to describe actions we generally think of as fowl.
What I am saying is, a "bad thought diet" can lead to mental illness, much like conventionally how a bad diet can lead to bad health. Such as, of someone watches the news als develops major depression because they become convinced the world is crime ridden and dangerous. There is nothing otherwise wrong with them, but they are very anxious about the world because of the information they take in. But this deals with demons, faith healing, and dead kids. Bronze Age ethics and homeless children. Fundamentalist religious beliefs beimg enforced to the detriment of civil rights and liberties of others. Public fights to keep fundamentalist religious creation mythos out of science classes.