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Why did DC Comics stop Batman from using guns and lethal force?

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In his earliest appearances, Batman was depicted as a brutal vigilante who used lethal force, including throwing criminals off rooftops and using firearms.

DC Comics decided to eliminate the character's use of guns and lethal force because the publisher feared that the sinister elements of the stories would be emulated by the comic's young audience. Consequently, the publisher mandated that Batman would never again take a life, shifting the character toward a more heroic and less lethal approach to crime-fighting.1