Some of Marvel’s most iconic street-level heroes are Spider-Man and Daredevil, and both are famously reluctant to take a life. At first glance, their shared no-kill rule might seem like another similarity between them.
But underneath that rule are two very different moral foundations.
Daredevil’s Rule Comes From Faith

The choice is very personal for Daredevil and rooted in his Catholic beliefs. Matt Murdock feels that people should not have the right to make the final decision on whether someone lives or dies. Killing a criminal would mean crossing a line that could fundamentally change who he is.
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That is Daredevil’s defining battle. In a world where violence is a part of life, Matt is always seeking to stop it from becoming an execution. He knows that if he starts to make choices about who deserves to die, it might be harder to get off that road. His biggest challenge is not only against the criminals. It is against the darker impulses within himself.
Spider-Man’s Morality Comes From Guilt

Peter Parker’s association with killing is a far more personal one: guilt. Uncle Ben’s death is the basis of Peter’s entire identity. Peter believes that he could have stopped the criminal responsible for Ben’s death but chose not to intervene. That failure stays with him and becomes the lesson that shapes his life as Spider-Man.
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To Peter, great power comes with great responsibility; he feels he should use his powers for good, not for killing. That is why killing can feel like such a fundamental betrayal of Peter’s principles. If he starts determining that certain people are beyond saving, he risks becoming the kind of person who believes his power gives him the right to make that decision.
That’s what makes the comparison of these two heroes so interesting. Daredevil refuses to kill because he believes judgment ultimately belongs to God. Spider-Man refuses because he understands, perhaps painfully better than anyone, what can happen when someone chooses not to protect a life. Same rule. Completely different reasons.
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