"The early Bat Man used a gun and killed and/or let people die."

Batman Killing
Quora

In the first appearance of Batman, "He punches the guy and sends him over the edge into a vat of acid and does not even try to help him."

Batman Killing
Quora

In his second appearance, Batman kicks a guy off a roof…

Batman Killing
Quora

…and it is later confirmed that the guy bought it.

Batman Killing
Quora

Two issues later, Batman brutally snaps this fella's neck

Batman Killing
Quora

"Here we see him kill not just a bad guy but a brainwashed pawn."

Batman Killing
Quora

Here Batman shoots a machine gun into a truck, killing everyone.

Batman Killing
Quora

On this page, Batman hangs a monster. Gruesome!

Batman Killing
Quora

"Later on in the 80's there were some deaths... "The Doomsday Book" Detective #572"

Batman Killing
Quora

Finally, check out Batman's gleeful smile as he sticks a bomb down a clown's pants.