I agree completely, I do believe that giving background to that character makes things more interesting, perhaps they joined up with a gang of raiders because they have no other skills to survive, other than robbery, maybe they don't like being a raider, but they have no other choice. If they have no morals at all, you should think of what went wrong in their head, what fucked their morality so hard that they have no regret murdering? You don't have to tell everybody else, why your raider is a dick, just use that as a basis to assume the role. As the article said Roleplaying is basically acting, though I've always called it co-writing a story, so what makes it interesting is how your character ticks, making that character seem real or interesting requires thought, why is your character a nutjob?
An example from one of my friends outside of FOnline is that: Lucy had grown up poor, and once she was on her own, she had become a prostitute. She was treated horribly by her clients, and did things she'd never want to do. Finally Lucy had killed a client, finding a new skill, an escape from a life of debauchery. She had a strong hatred for men, and was supportive of her fellow females.
Lucy's past contributes to the way she is now, her strong hatred for men, makes it interesting for men to hang around her, because at the slightest rude comment she WILL snap, and she WILL attack him, the only thing keeping her from killing all men is a slim grasp that they are human, she knows that not all men are horrible, but she believes that 99% of them would do what they did to her in her past life, and she could be right, because men LOVE sex.
