Why do Gordon and Batman choose to pin Two-Faces crimes on Batman?
A number of reasons: 1) When Dent had Gordon’s family at the place where Rachel died, the police had a border already set up. By this time, Joker was in custody. Had they blamed Joker, everyone would have known they were lying. That would prompt an investigation into the other deaths. Batman and Gordon wanted to preserve Dent’s image as the “White Knight,” giving the citizens of Gotham hope. 2) Batman wouldn’t want to falsely pin crimes on even someone like the Joker. 3) After the events of The Dark Knight, Batman can no longer allow himself to be affiliated with Gotham Police without risking more deaths. By “rebranding” himself, he not only severs all ties to authority, he is also “becoming the villain.” As Dent is allowed to die a hero, Batman must accept the opposite responsibility. (i.e.- Dent’s phrase, “You either die a hero or live long enough to see yourself become the villain.”) 4) Harvey Dent is a leading prosecutor. If word was to get out that he’s a crazy killer, all the cri