Please don’t use people with mental illness as a punch line. I suspect you wouldn’t dream of exploiting people with rheumatoid arthritis or asthma or juvenile diabetes in that manner.
This comic is in miserable taste. Do not use mental illness as a punchline or the mentally ill as the target of a joke. People with dissociative identity disorder (aka multiple personality disorder) have a complex form of post-traumatic stress disorder usually caused by overwhelming abuse in childhood. They are not schizophrenic or psychotic. Why am I not laughing?
Google the “Fort Pillow Massacre.” American Civil War.