I think it's easier to come up with doom and gloom type songs. All that teenage angst and introspective navel gazing. But there does need to have darkness in songs because it reflects life...which at times is "a piece of shit, when you think of it". But you need some balance so I don't think it's healthy immerse oneself in it. I like to hear music that is positive and lifts my dark, sorry, soul. So I go back to The Beatles every now and then...Love is all you need I suppose there's irony there too for me as Lennon's Plastic Ono Band is one of the most harrowing collections of songs and performances I've heard.