How we cite our quotes: All quotations are from Batman.
Quote #4
JOKER: Can somebody tell me what kind of a world we live in where a man dressed up as a bat gets all of my press? This town needs an enema!
To Joker, Batman is a criminal, taking away from him what he really wants: attention.
Quote #5
KNOX: His parents were murdered in that alley. […] Poor kid watched the whole thing happen in front of him. […] What do you suppose something like this does to a kid?
Criminality is a cycle. Often, people who have had crimes committed against them commit crimes. Bruce Wayne becomes Batman, a vigilante, which is technically illegal. And he grows up to kill the Joker, which, while appreciated by the citizens of Gotham, is also technically a crime.