system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Could Batman, Harvey Dent, and Gordon have cleaned up Gotham if Harvey never fell and became Two-Face?

This question can apply to both Comics and Nolan Batverse.
gpt
If by cleaned up you mean reduced or eliminated street-level crime in Gotham, then yes, it's probably feasible.  

If by cleaned up you mean gotten rid of the supervillains such as the Joker, Bane, etc, then no.  Guys like them are drawn to Batman.  As long as Batman exists, then there will be lunatics wrecking havoc in Gotham.  And if Batman ceases to exist, then a clean DA and police commissioner will not be sufficient to keep Gothan clean, much like it hasn't been sufficient in the past.