So all the press clippings Lois collected of the "mystery man" saving people and then the several instances that showed him saving people (as a child and as an adult) didn't do anything to show you what kind of moral code he had in regards to sanctity of life?
Was there supposed to be a monologue where he detailed why he feels the need to never kill anyone ever in order to be good storytelling?
a scene of him saving someone while avoiding killing a criminal prior to the Zod scene would have done it.