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When an aged Harley comes to get her granddaughters, the DeeDee twins (real names Deirdre and Delia Dennis). The screenplay reveals some additional info: Dana's father disapproving of her going out with Terry is another reminder that he hasn't completely put his past behind him.When Bruce forces Terry to give up the bat-suit, he's trying to protect the boy, but he's so lousy at relating to people that he can't say what he wants.Poor girl is nearly killed and has absolutely no idea why. Watching Dana get hurt when the Jokerz attack her and Terry at the nightclub.This time, she's going to be hit with the realization that her Puddin' isn't coming back. Harley has watched him cheat death before on multiple occasions, and been distraught, only to have him pull through. As utterly twisted as their relationship may be, by this point, they've been together for years. The fact that the Joker dies for good.It's the end of the battle with Batman, and she's getting a happy ending. A chance to settle down as a family with her Puddin', no more fighting, just a happy family. The other thing is that, for the warped Harley, what was done gave her what she's wanted for a long time.
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She herself was twisted to think that she could take a kid that underwent Mind Rape and somehow salvage him into an adopted kid. Going off of that and taking it even worse, she casually tells Batgirl that she'll "make it right", in regards to Robin being tortured and completely screwed-up.And now, she is Joker's accomplice as he tortures and mind-rapes Tim into "Little J." It's yet another painful note on their twisted and sad relationship, and another display of how Joker destroys anything that he touches. This woman started out as a psychologist and, despite her being drawn to Arkham for the thrill of the more "extreme personalities," she couldn't have entered the field without some kind of desire to help people. While some consider Harley Quinn going along with Joker's experiments on Tim her crossing the Moral Event Horizon, think for a moment.Although it's not stated, it can be implied that this event was what motivated Batman to cut ties to not only his sidekicks but to the Justice League as well, including Wonder Woman.Fighting the bad guys, and no one ever gets. Consider how adult Tim feels just before going under, at the end: And it's not just young Tim in the flashback who's messed up by what happened.
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