Finally!...Something i can professionally comment about!!....
onetrack, while some people with depression do commit suicide, there is also impulsive suicide...that is, suicide that happens without the person necessarily showing signs of depression at all! Take the person who breaks up with his wife, then goes and hangs himself...Not depressed necessarily, rather an impulsive act due to circumstances.
Not everyone who is depressed commits suicide and not everyone who commits suicide is depressed!