It really depends on the perspective of things ⦠I always thought that anything like this could be interpreted depending on how it is being looked it, by which perspective. As far as I am concerned the ādoom and gloomā stories are much more didactive/educative than the ālived happily ever afterā kind.
A happy ending is teaching you possibly about hope?
That is nice, but also could be teaching you about false hope and that everything will be fine in the end and that you are entitled to a āhappy endingā ⦠you can see a lot of people having that mentality and, letās just say that it is not really for their own good, since they seem to believe that EVERY error they make is negligible, because āthe best is yet to comeā ⦠and thatās usually fine if you are in the process of working towards something. What happens to all the people that get where they wanted to be and still think that āthe best is yet to comeā and scap all they have and chase the horizons? Never finding happiness or fulfillment in anything? That doesnāt sound good to me.
A lot of people would argue that this might be a good thing, but if that is so, why do we see depression rates breaking records and people all around us falling to bad habits like booze or heavy drug use? 
On the other hand the āmeh, that happened, life goes onā stories, contain a good amount of hope (else there wouldnāt be any story, eh?
), a good amount of āhappy endingā (people survive - most of them anyway) and a good amount of disappointment, struggle and concessions, which, letās face it, is something that real life contains quite a bit of. Arguably those kinds of stories prepare you more for reality than the āhappyā ones.
Here is the translation of what someone else wrote under one of the songs of our most dark themed (yet successful) rock back, combined with the animation of a depressing Russian story about a mermaid. By the way, whoever combined those two works of art was a GENIUS: (the animation has no words, so you do not need to know Russian to watch it. It is awesome!
)
āPain brings us face to face with our deepest fears. This band was never depressing. They might have not had the most happy rhythm musically, but their work was a gift of light. They tried every aspect of human feelings to be turned into light, even the wildest, darkest recesses of the soul. Their art alone, is lightā
Quite the stark difference from that author though, eh? 
Come to think of it, even outside of those dudes, I can scarcely think even of ONE happy Greek rock song. Sounds good to me.