Batman Vs. Superman Movie: 10 Potential Reasons They Could Fight

9. Batman Is Too Hardcore

While both heroes have strict codes against killing, that wasn't always the case. Before the Comics Code Authority in the 50's forced comic book companies to adhere to strict censorship, it wasn't uncommon for either Superman or Batman to cause the death of a criminal through accident or intention. In Batman's first appearance, he casually chucks a criminal off a roof! Post-Comics Code Authority, both heroes have curbed their violence, but Batman often still has murderous impulses. In "The Dark Knight Returns", Batman rigs some thugs' bomb to blow up before they can use it, resulting in their deaths. He muses that "two men die, leaving the world no poorer". Compare that to the anguish Superman has over killing Zod, someone much more threatening than two mooks. As the paragon of heroism, it wouldn't be crazy to think Superman might find Batman's laxness towards violence objectionable and confront him over it. That's not even mentioning some of Bats' other questionable methods such as using children as partners, terrifying citizens, and using nigh-lethal weaponry.