I'm not familiar with the exact canon of how Gwen died, but I don't think it disproves the idea that "with great power comes great responsibility". It's still your responsibility to make sure people don't get hurt, not just to try to use your powers for good.
In HPMOR, Harry calls it "Heroic Responsibility".
"You could call it heroic responsibility, maybe," Harry Potter said. "Not like the usual sort. It means that whatever happens, no matter what, it's always your fault. Even if you tell Professor McGonagall, she's not responsible for what happens, you are. Following the school rules isn't an excuse, someone else being in charge isn't an excuse, even trying your best isn't an excuse. There just aren't any excuses, you've got to get the job done no matter what."
I can "prevent someone from getting hurt" right now by selling my computer and giving the money to some charity. I don't do this. Some people here may argue that that's still immoral, especially the Givewell people, but almost every human being alive acts that way. People care more about their family and friends, and secondarily about people like themselves, rather than caring about everyone in the world equally.
From this point of view, the death of Uncle Ben is supposed to show that if Peter doesn't become a hero, the people he cares about wi...
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