It has long been understood that bullies typically have been bullied themselves.  A few months ago I came across an interesting write up about the correlation between bullying behavior (and victimization from such behavior) and psychiatric illness.  In a study published in JAMA Psychiatry “researchers have found that elevated risk of psychiatric trouble extends into adulthood, sometimes even a decade after the intimidation has ended.”  This is likely directly relevant for many disruptive professionals.