Whether or not Peter would kill Norman is never brought up in Spider-Man. In fact, some dialogue between MJ and Peter in Spider-Man 3 suggests Peter did indeed kill the robber who shot Ben.
Also, Bruce's vow not to kill is followed immediately by him burninig down a temple with numerous people inside it, including the guy he said he didn't want to kill.
MoS isn't ambivalent about it unless you think this Superman was a killer before he met Zod for some reason. Hell, it's shown that he avoided violence against other sentient beings prior to the invasion.