So, the villains are just going around town, doing whatever they please. What are you going to do about it? What any other hardcore girl with guts would do, of course - put on a black outfit that could kill with looks alone and start thrashing any bozo committing crimes in your city. The Penguin's robbing a bank? Not on your watch. Scarecrow's taken innocent people hostage? He won't after you're through with him. Heck, when you're done with Gotham City, no one will even remember who Batman is.