What is one belief that kept the mentally ill out of society and the recipients of horribe trwatments was?

One prevailing belief that marginalized the mentally ill was the notion that mental illness was a result of moral failing or possession by evil spirits. This perspective led society to view individuals with mental health issues as dangerous or sinful, justifying their isolation and inhumane treatments. As a result, many were subjected to harsh conditions in asylums or faced stigmatization, further entrenching their exclusion from society. This harmful belief system contributed to a lack of understanding and compassion for mental health conditions.