I think a lot of people would argue that Tim Burton didn't really 'get' Batman, or even comics, either. He certain said some pretty unflattering things about the genre at the time.
So, it isn't like Burton's the only culprit here.
In Batman Begins, Bruce is trained by the League of Shadows. The final step in training is killing someone. He refuses... and then sets the place on fire and it explodes, presumably killing everyone inside. He does a number of lethal things in Dawn of Justice.
There's several times he kills back in the old days in Detective comics. He kills someone in Batman #1 - very first issue of his title.
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