Originally Posted by JDonaldD
It's a really compelling ending but in all seriousness, I think it would be easy to spin Dent's story to the public as a victim of the Joker, which is how we see it as audience members.
It is not only that. Sure it could be easy to say that he was a victim of the Joker, because he really was a victim. But you have to take into account that all the mob would be again free to roam the streets, at least they would have the means to hold a grip into Gotham again, and bringing the hope of the citizens to the ground.
The thing is, I don't think Gordon and Batman became corrupted by the lie. Why? Because Batman took the fall.
Instead of being something morally dubious, it becomes a sacrifice. As Gordon says at the end, he can take it, he is not a hero. He is something more. Whatever Gotham needs him to be. By definition a sacrifice is an offering, and that's what Bruce did. And ultimately, and perhaps paradoxically, that's something worthy of heroism.