"The year is 2050. The country has been undersiege for several years by a large violent street gang called ‘The Mutants’, who use excessive violence against their enemies (which includes murder). 'The Mutants' have been forced to disband after their leader was captured and sent to prison due to Batman. Batman is pro-justice, a supporter of proportional violence, and has a strict no kill policy.
2/3s of the gang now become a group called the ‘Sons of Batman’ with no prompting to do so from Batman himself. The ‘Sons of Batman’ have decided to patrol the streets and fight crime. They still intend to use their most violent tactics, but only on people deemed criminals by Batman."