Almost all directors who have ever done Batman, with the exception of Bruce Timm, have struggled with the "no killing" policy, and in some cases with the "no gun" policy.
Burton certainly seemed to understand the "no gun" policy, but he frequently had Batman do things that you knew had to either result in death or lead to the strong probability of said characters' death.
Nolan seems troubled by both. He's at least tried to articulate the "no killing" policy, but hasn't really tried to put it in practice. Batman essentially firebombs Ra's temple, but does make a curious effort to save Ra's Al Ghul, and no one else. Then in TDK, he "kills" Harvey Dent and also blows up a good portion of a parking structure. While no one was harmed, it was certainly a reckless action that could've easily resulted in death. In addition, Nolan seems to have no qualms about Batman indirectly or directly using guns.
Then in Schumacher's films Batman kills Harvey Dent again, albeit unintentionally, but it seemed like throwing coins would ONLY result in him falling into a pit of spikes. Ironically though Batman & Robin actually gets both the "no killing" and "no guns" rules absolutely correct.
I think directors, especially in regards to action, don't really consider a lot of the unintentional contradictions of every action scene. Crashing a train, blowing up a building, or pancaking cop cars more than likely is gonna kill someone, but it makes for good visuals...so it's usually a while before they start to leave a sour taste.