According to Dr. David Healy in "Talking Back to Prozac, the depressed don't commit mayhem.
Making Sense of the Great Suicide Debate Just follow the links please.
But he also saw that his position would be strengthened if he could cite the results of a drug experiment on undepressed, certifiably normal volunteers. If some of them, too, showed grave disturbance after taking Pfizer's Zoloftand they did in Healy's test, with long-term consequences that have left him remorseful as well as indignantthen depression was definitively ruled out as the culprit.
Well, there goes Dr. Healy again...
People with other MH diagnoses get depressed.
People who are depressed are prone to suffer other mental anomalies, including paranoia, cognitive impairment, memory loss, anger/explosiveness, substance abuse, etc., etc.