Believe it or not, the list of people Batman has killed is pretty long. Forget that the Dark Knight's supposed "one rule" is that he doesn't kill, he's actually a mass murdering maniac. This is especially true of his earliest adventures, which saw the vigilante brandishing and using a gun every chance he got. From mowing down villains to times Batman killed innocent people just to take the Joker down, there's no shortage of death at the hands of Batman. He might even have the biggest body count of all the DC superheroes.
The people Batman has murdered (be it outright or accidentally) includes the Joker, a vampire named the Monk, Dracula, and even Darkseid himself. He's shot people, burned them alive, hacked them to pieces, drained them of their blood, and hung them from the Batplane. It's a wonder this psychopath is still generally regarded as one of the best superheroes. Here are people Batman killed who didn't deserve it, so you can decide which end of the moral spectrum he truly falls on.
That Time He Burned Some Criminals Alive Then Had Sex Next To Their Corpses
Legendary comic author Frank Miller is known for many things, but subtlety isn't one of them. Although he redefined Batman for a new generation with The Dark Knight Returns, his later Batman stories really suffered from a decidedly fascist take on the vigilante. Nowhere is this more obvious than in All-Star Batman and Robin, the Boy Wonder, which was drawn by Jim Lee.
Aside from Batman verbally and physically abusing a young Dick Grayson throughout the story, he also burns a group of criminals alive at one point for trying to steal a shipment of bleach (not kidding). Not only does he light them on fire with the same bleach they were trying to steal, Batman then proceeds to have sex with Black Canary a few feet away from where the men are burning to death.
The Dark Knight Snaps The Joker's Neck
The Killing Joke by Alan Moore and Brian Bolland was designed to be the last Batman/Joker story. It's meant to be the last straw, the story in which the Joker has gone too far. After the Joker tortures a broken Jim Gordon and then cripples and rapes his daughter, Barbara (AKA Batgirl), the Clown Prince of Crime and the Dark Knight have one final showdown. While Batman has the opportunity to give his archnemesis back to the authorities, he decides that he's seen enough horror at the hands of the Joker. After a shared laugh in the rain, the implication is that Batman snaps the Joker's neck, putting an end to the Clown's reign of terror once and for all.
Batman Snaps A Dude's Neck
Batman has found so many different ways to kill bad guys over the years that some of them have become laugh out loud funny. For instance, the time the Dark Knight snapped a henchman's neck for no apparent reason. Mikhail, Doctor Death's second henchman, is fighting Batman in his apartment. When he pulls out a gun, Batman jumps out the window to safety. Little does Mikhail know that the Bat plans to swing back around for a big finisher.
When Mikhail looks out the window, gun drawn, Batman is already on top of the henchman. He delivers a lethal kick to the villain's neck, snapping it, and killing the bad guy instantly.
The Monster Man Is Hanged
Dr. Hugo Strange, who debuted in Batman's earliest Detective Comics adventures, returned in the pages of Batman Vol. 1 #1 with an all-new master plan. Using a special growth serum, the mad scientist turns patients from an asylum into Monster Men - raging giants bent on destruction. When Batman gets word of this, he decides to get on the Batplane and stop Strange's henchmen from transporting one of the monsters to Gotham City.
Batman, who loves guns in his early days, uses a machine gun to shred through the henchmen's truck causing them to crash. Then he captures the Monster Man by tying a rope around his neck and hanging him from the Batplane. So yeah, Batman flies his fancy plane around with the corpse of his enemy suspended a few feet below.