What does crazy is as mean?

"Crazy is as mean" is an idiom that is often used to express the idea that people who are mentally ill are also dangerous and capable of hurting others. It is a highly stigmatizing and inaccurate statement, as there is no evidence to support the idea that people with mental illness are more likely to be violent than anyone else. In fact, studies have shown that people with mental illness are more likely to be victims of violence than the general population.