Maybe you guys just want an excuse to feel intelligent. Are you calling every Goth intelligent? Oh god no.
What about those who subscribe to an "Emotional State" just so they can fit.
Some and all are two completely different things, they do not equate eachother just because some intelligent people happen to be depressed(All bills are johns, some johns are marys. Are all bills Marys?). Maybe intelligence is just a result of abnormalities, a "Mutation" so to speak. As going through life with a different outlook than the norm can form alternate perceptions, giving you a vaster view of the world when you can also see the normal view of the world.
An intelligent person just realizes how much of a moron they really are, so they get sad. Stupid people just can't figure it out, but get sad about other things. Like the head falling off of barbie. Or when you sister flushes your fishies down the toilet after putting lotion on them