People are obsessed with true crime stories, like Netflix's "Making a Murderer" and the "Serial" podcast. But what is it about these gruesome tales that keep us coming back for more? A.J. Marsden, an assistant professor of human services and psychology told HuffPost one reason true crime might be so addictive is because it offers us a look into the deviant parts of the human psyche. These stories appeal to us partly because we have a need to understand the motivation behind such brutal, senseless acts of violence. “We want to understand because we are afraid,” she added.