schizophrenia and personality disorders are a small portion of most mental illness.
What about those who have suffered depression, bipolar disorders, anxiety, agoraphobia, sociophobia, post traumatic stress disorder?
Most people suffering from post traumatic stress would never hurt a soul. They just withdraw from people.
being an alcoholic is a mental illness. The person is using the alcohol to self medicate themselves because it gives them a way to escape from the mental illness they have for a little while. Mostly anxiety and stress but could also include any number of illnesses.
Should we refuse to allow alcoholics from owning guns as well?