Re: What are your complaints? What would you do differently? *SPOILERS* - Part 1
^ I never understood that complaint about what the general says. It doesn't seem weird to me that a US general, whose job is to protect the US, would be concerned with the safety of the country.
Also, Jor El put the Codex in Kal El so that when the time was right, the Kryptonians and humans could coexist on Earth (without terraforming the Earth). He suggests this to Zod at the end, but Zod refuses to compromise.