I grew up with Superman the Movie. I saw it in the theatre when I was 5. Reeve will always be Superman to me. I loved it then and still have a special place for it in my heart and memory as a child. But all children grow up and now I would like a Superman story that is grown up too. I still want him to have his ideals and stick to his principles but be faced with more grown up challenges and decisions. The ultimate Boy Scout being thrown into a world of darkness and doubt to be that light humanity lacks to show them the way.
Maybe zod is the first kryptonian to reveal himself and people are frightened of him. And rightly so. So when another emerges all they know is fear but to show them they have nothing to fear from him he cooperates with what they need him to so to feel safe.
Imagine Zod, sitting at a table of the unites nations or congress or the senate, discussing terms for the worlds surrender to him when someone speaks out against him. If you could move faster than the eye can see and had devious intent all you would have to do is blur over, and crush the mans windpipe, sit back down, and watch him suffocate. Or perhaps a bigger show of force is needed like microwave someone from the inside with heat vision until their eyes and brain boil out of their face and ears. That would probably strike fear in humanity.
Now another comes and of course everyone would fear two aliens over one. Would you really trust someone with that much power to always do the right thing? I'm not sure I could without proof and evidence. Even then you'd watch your back for signs of an anterior motive. No one on earth is that good so how could someone from another planet be? Especially after seeing what Zod can do.
If someone could kill you in the blink of an eye and there would be no witness that could see it or prove it, wouldn't you be terrified?
We love superman because that's who he is and we know him. But to a world that doesn't trust comes more slowly. Even great villains have saved people to earn trust and just when we trust them the most is when they turn on us.
I may sound a little paranoid but these fears are real and I have a feeling they will be the basis for the tone of this movie. Or at least I think they should be.