In the early 2000s, Sydney was rocked by a series of gang rapes. Victims were ordinary Australian girls, some as young as 13. The perpetrators were Muslim, mostly Lebanese and some Pakistanis. Two cases—the Skaf brothers case and the Khan brothers case—received extensive newspaper coverage, but the phenomenon was more widespread. Sexual assault rates increased 25 percent between 1996 and 2003 in Sydney, even as every other type of violent crime was declining. The gang rapes were similar to the “grooming gangs” operating in Great Britain during the same period. The difference is that in Britain the problem was allowed...