This article was one of Narratively’s top stories in 2014. It was also featured in The Week, Longread’s Art of the Con, and syndicated with YourTango.   GM once spent three weeks casing a mother of three, learning everything he could about her life, routine and preferences. When he finally found a way in, he robbed her for over $1,000. It was a good score. And, because she was a piece of shit, GM concluded, the crime was justifiable. He later found his research was flawed, however. The woman’s husband had recently left her, burdening her with the care of three children. And she was in financial trouble. She wasn’t so bad after all. So he gave the money back. Well, half. “She deserved…