system
Given the following post, respond as if you're commenting on Reddit:
human
[Watchmen Movie] Can someone explain to me exactly what Ozymandias plan was and why he did it?
gpt
He was worried that the United States and the Soviet Union would have a nuclear war. He decided that if there was a huge threat to all life on Earth, they'd have to work together to stop it, then there would be peace. So he created that huge threat, by blowing up New York City and other major cities around the world, and making it seem like Doctor Manhattan was to blame. Because Doctor Manhattan is so powerful, the US and the Soviet Union agreed to work together to try and stop him. 

Doctor Manhattan decided that he couldn't do anything about this, and left.