Batman’s No Killing Rule Stops Him From Being His Best While it’s difficult to argue with Batman’s reasons for enforcing a “No Killing” Rule, the principle is nevertheless problematic.

Marvel just issued a major challenge to superhero "no kill" rules, as one hero suggests that the hero community is better off killing their villains.

Batman's no-kill rule is DC's very first retcon - but the real history behind this rule is better (and darker) than any fan could have imagined.