who'd want to read about gangs?

A guy came by the Information Desk wanting to find a book called 'Staunch', about gangs. I found it for him, and almost asked him whether he was wanting to join one. He didn't look like the studious type. About twenty minutes later, a woman came to the desk asking for books on gangs. Hmmm.. I found the other three books we had on gangs, and she took them all. It turned out that she and the guy were together. They looked through those books as though they were looking for family members in a school journal. I wouldn't want to make assumptions, it's so un-librarian-like isn't it?