First of all, I don't have to prove a negative
You are the one making the patently false claim that Superman (and lois) did not kill Zod and Ursa in
Superman II. This is not supported by the 1980 release, yet you blathered on with this shaking need to say the Salkinds' Superman did not kill.
Instead of simply providing evidence that Lester, the Newmans, Puzo, et al., never intended Superman to kill Zod in an act of revenge, you insist--based on absolutely nothing---that Zod and Ursa were not sent to their deaths. You could have resolved the matter by supporting the claim
you chose to argue with that frightening thing called evidence, but as stated earlier, you do not have evidence, since those responsible for making the film never said or implied the intended outcome seen in the theatrical release was not the message they wanted to send.
This "Superman does not kill" / "Superman was not getting revenge" fit of delusion is all yours, and in addition to trying to rewrite the meaning of the scene in question, you fail to understand that not only did Superman take his revenge on Zod, but this behavior was bolstered in the diner finale, where Clark used his powers in an act of revenge against
ordinary human Rocky. That's
your Superman. Revenge is part of his character, and he killed Zod.
You can continue to spin in Kleenex-soaking denial about this, but again, there's no evidence supporting what
you want the film to say about Superman, not in 1980, and certainly not in 2023.