Did everyone see Man of Steel yet? Was Zod retarded?
Zod: My life for Krypton and its people.
Others: We found this super suitable planet where we would all be invulnerable due to the Sun/atmosphere.
Zod: Let us repopulate Krypton there.
Others: Very logical.
Zod: But before that we need to make it shitty, like Krypton, thus negating all positive effects of Earth.