Originally Posted by OutRiddled
Not in the same way as The Killing Joke. Joker never actually does anything with Dent, only steer him towards the revenge path against the corruption that led to his tragedies.
In Killing Joke, he shoots Gordon's daughter and tortures him with images of her wounded body.
In The Dark Knight, I can't remember the exact dialogue but all he does is convince Dent that Gordon and the police are responsible.
You're completely forgetting or ignoring the fact that Joker set up the whole scenario that led to Rachel's death and Harvey's scarring. The biggest trick Joker plays in the whole film is switching those addresses on Batman. He knew exactly what he was doing.
He manipulated everything to get Dent to do what he wanted.