system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman II] Why did Superman kill Zod?

Couldn't he have literally just sent Zod to prison, since Zod no longer has any powers?
gpt
Did you notice how Superman took the Kryptonians' powers? They were bathed in red light. Presumably, this is because Superman was simulating the red sun of Krypton, which would have purged the yellow sun radiation from their cells, but only temporarily. Soon, maybe in hours but perhaps within minutes, they would have been fully restored to power. Not being able to put them back in the Phantom Zone, Superman's only choice was to kill them.