system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman] A supervillian has been sentenced to death. The only way to execute the super durable monster is Superman. Will Superman kill if required by law?

Basically the title. Some super villian attacked Metropolis, Superman incapacitated him and handed him to the authorities. After due process, the villian was given the death penalty due to multiple murders. 

However, the super villian is super durable. Poison injections, electrocution, firing squad etc do not damage him at all. Its known superman has the strength to easily kill the villian, and the authorities request Superman's help in the matter.

Doea the Man of Steel kill?
gpt
No, superman only really kill if forced too, like Doomsday. In this case, the authorities can clearly contain the supervillian, so there is clearly no need to kill him beyond revenge, which superman doesn't condone.

If really needed superman might send him to the phantom zone, but since killing isn't nessecary here, he won't do it.