I just saw the movie last night. They are just making things up. It's an immagrant story because Superman is an immagrant. The way they are acting the film is about him defending undocumented immagrants when it's not. That's not in the movie at all.
I like that we have a film with an over the top unjustifiably evil villain. Too many films make the villain sympathetic and not actually evil. So I like that Lex Luthor isn't.