It matters because you asserted it as an unambiguous fact that Superman killed Zod, and built a whole argument around that revisionist assumption:
This argument is invalid because the foundation it's based on is invalid. It is egregiously false to claim that the movie presents death as something to be celebrated, because it's egregiously false to claim that it explicitly depicts death at all. It is egregiously false to claim that nobody objects to the appearance of Superman killing, as the past few pages of this thread have explicitly demonstrated. So the conclusion you draw about the film's message based on that incredibly clueless misreading of the text is pure pretentious claptrap. "Framing" is irrelevant if you're incorrect about what's inside the frame to begin with.
It absolutely does matter whether your arguments are based on a valid premise or not. Nothing matters more. Garbage in, garbage out.
Christopher, you do realize I'm on the side that wants a brighter, more optimistic, more moral Superman that doesn't kill and isn't morally ambiguous, right? I'm not on Trek_God_1's side here. I'm not a Snyderman fan. I'd appreciate not being regarded with the same tone as someone who enjoyed Superman being turned into a monument to nihilism.
But no, when a movie shows a mortal (as Zod and the others had become mortal) being thrown down a chasm with no visible bottom and no indication as to a different fate, I do not think it is reasonable to conclude that that film has depicted anything other than that character's death.
But let's say Superman doesn't kill Zod in Superman II. Even if that is the case, my argument -- that tone and framing are what matter -- still holds, because we see a version of the same archetype as Superman who does kill villains in the Captain America movies. And all three of those movies are still brighter, more optimistic, more hopeful, more morally-grounded, and more appropriate for children than Man of Steel or Batman v. Superman. Because the Captain America films lack the nihilistic themes that Snyder's works are filled with.