Death has traditionally been taboo, and yet we celebrate it, with a lot of excitement and enthusiasm nevertheless. "Our global culture has evolved to embrace this taboo with a hefty dose of humor, perhaps to hedge against all of the chaos in our world."(trendhunter) I couldn't have said it better.
Let's start with one of the major reason I believe there is such a huge addiction to the macabre. It has always influenced a transformation and perhaps an avenue for us to actually understand our own troubles. The contrast of darkness in life to the 'lighter' points of life a relief, a comfort zone in which we can understand their personal conundrums or possibly relate to a life that is more familiar tot the one inside of themselves than the one they are living externally.
To some it is the forbidden value that is most appealing. It's the forbidden delights regarding the subject of Hell, the true macabre theme of life, that makes more sense.
For some individuals is just a mere ego trip, it's a high on which they strive at the fullest potential. The element of being naughty. Being uninhibited. "The forbidden desire to entice people to a new and untried level!" Afterall, our portrayal of villans is their freedom to be and do things which are often looked down on in society. Villans do the things that we don't dare do! Movie villains often have more multidimensional and interesting personas than the hero/good person. Hell! It's much more exciting, thrilling, and even more popular to be the villain.
Sometimes we want to experience the dark to avoid becoming dark in life. Sometimes we want to experience the dark side to remind us of the darkest sides of ourselves that we truly enjoy but should not actualize. Sometimes it's just so we satisfy our alter dark ego, and we all have it whether we admit it or not. "There is something interesting, darkly delicious, and multidimensional in portraying a dark character!" To understand the macabre is to understand ourselves in our entirety as an individual, and a society as a whole.