"The popular belief is that people with mental illness are more prone to commit acts of violence and aggression. The public perception of psychiatric patients as dangerous individuals is often rooted in the portrayal of criminals in the media as “crazy” individuals. A large body of data suggests otherwise.
People with mental illness are more likely to be a victim of violent crime than the perpetrator.[1] This bias extends all the way to the criminal justice system, where persons with mental illness get treated as criminals, arrested, charged, and jailed for a longer time in jail compared to the general population.[2]"
https://www.ncbi.nlm.nih.gov/books/NBK537064/