system
Given the following post, respond as if you're commenting on Reddit:
human
[Watchmen] Why did Dr. Manhattan kill Rorschach?

I watched this movie three times now and I still don't fully get the scene with the two. I know Rorschach says that Manhattan has to kill him but why???
gpt
Because Rorschach is going to spill the beans, even though he knows it will cause nuclear war.

He can't do otherwise, he CANNOT compromise. Even if it means destroying the world. And he knows it. He doesn't want to destroy the world but he's incapable of doing otherwise, so his third option is to die.