As far as I’m concerned, there’s little in MOS
that needs to be rationalized or apologized for in a follow-up movie. Quite explicitly, Zod’s terraforming scheme would have killed all life on planet Earth. Supes prevented that; and I require no further explanations or “closure” on the matter. Now, this isn’t to say that Snyder/Goyer won’t
address the backlash and complaints (coming from some quarters) in the sequel. But if such an attempt at “retroactive rehabilitation” happens, I’ll criticize it as entirely unnecessary.