Not everyone that commits suicide was depressed. /Rage Quit is arguably a type of suicide but there are plenty of others.

http://en.wikipedia.org/wiki/File:Th%C3%ADch_Qu%E1%BA%A3ng_%... Seppuku Many cultures have promoted it for one reason or another http://en.wikipedia.org/wiki/Seppuku http://rt.com/news/india-ritual-suicide-sati/ Some native american cultures had the idea of the elderly walking into the snow when they became burdensome.