Why didn't the last survivors, the council, and Kal-El's mother go to the phantom zone to at least survive or in a scout ship to find other inhabitant planets during the destruction of Krypton in Man of Steel? They had a chance to live like Zod did. We also see Zod need the codex so the unborn child may have the destiny in their life as they are programmed to be. So that explains the council also sent unborn child machine to the phantom zone so why didn't they also go the zone to survive?
In the Superman Mythos, it is tradition that the Kryptonians don't believe the planet is doomed, until it's too late. Also, they eliminated their space program centuries, if not millenia before, so scout ships are out.
Naturally, the criminals in the PZ would want to kill them, and try to escape.
Finally, Jor-El and Lara wanted to leave, but it was impossible to do so-------the whole point of the rocket was for Kal-El to be the sole survivor.