system
Given the following post, respond as if you're commenting on Reddit:
human
[Man of steel] If zod had the world engine that could literally terriform any planet into krypton why did he still choose to wipe out the human race? Why not pick Mars or any other uninhabited world?
gpt
Because in spite of their technology, the World Engines never successfully created stable long term biospheres on any of the colonies.

His hope was that *starting* with a planet that supported life would make the difference.