What was the motto of the Watchmen comic?

Watchmen takes place in an alternate history United States where the country is edging closer to a nuclear war with the Soviet Union.

After government-sponsored superhero the Comedian is found murdered, the vigilante Rorschach warns his former colleagues of what he believes is a conspiracy to kill costumed heroes.

As the story progresses, the protagonists discover that one of the heroes has resolved to stave off war between the United States and the USSR by carrying out a plan that will kill millions of innocent people.