The vast majority of mental illnesses are caused by trauma. Our entire society is fundamentally trauma-engendering because many of our primary life-or-death drives center around life in a tribe, and we have decimated our number and quality of social relations as well as our connection to meaningful communal labor. This concept of trauma-induced illness has been actively suppressed in psychology literally since Freud and still is today (see: why CPTSD is not in the DSM-V). If the human race continues to advance scientifically, modern day psychiatric care with its myopic emphasis on mysterious "chemical imbalances" will eventually be considered as barbaric as the use of asylums.