One of the qualities essential to writing exciting stories, whether for page or screen, is an ability to abandon one's morality. We simply cannot be good writers and good people. One must be able to access one's darkest self, one's venality and pettiness and murderousness.
Personally, I see little distinction between an artistic mentality and criminality. You couldn't possibly create a compelling story without some wickedness or some fascination with the disgusting. Being good is a hindrance to a writer.