system
Given the following post, respond as if you're commenting on Reddit:
human
[Tim Burton's Batman] Why is this Batman willing to kill?

So, as an up-and-coming criminal, I've recently moved to Gotham. I heard it was a good place to make some cash, but after a few weeks I start hearing about this "Batman". Now, I'd heard about this freak back when I was in Metropolis, but people said he didn't kill anyone. Well, you can imagine my surprise when the Bat drops this guy, Johnny Gobs, off of a roof! 5 stories, dead on impact!

Like I said, I thought Batman didn't kill anyone. Why the Hell is he throwing people off roofs? He even did it to The Joker! What the Hell!?
gpt
His world was much more violent and cynical than any other universe that has a Batman.

His genesis was not from a random mugging by a desperate Joe Chill, but a cold, brutal murder by Jack Napier. Jack clearly took pleasure in shooting the Wayne adults and even took time to torment him with a chilling question, just to prolong his fear. (And he likes the way it sounds.)

A Bruce that is traumatized by Joe Chill sees crime as an awful thing, but also a faceless, complex problem that requires a complex solution. He recognizes sometimes people have real problems and need help, not punishment. At his core, he simply doesn't want anyone else to feel what he did that night.

When Jack Napier killed his parents and then tortured him, Bruce realized this was a personal struggle with a personified incarnation of crime. This Bruce saw Jack everywhere. Criminals were not just superstitious cowards, but monsters that needed to be punished. This Batman was much less of a detective and more of a brutal avenger, doing whatever it took to end crime right then and there. He had no patience for people that might provide a valid story behind their actions and zero tolerance for people that violently broke the law.