Rorshach's no fascist. He's a moral absolutist, he's a racist, he's a right-winger, he's an atheist, he's a conspiracy theorist, and he's obsessed to the point of being crazy, but he's not what I would call a fascist.
Lawful in alignment, certainly, but lawful neutral or possibly even lawful evil because of his ruthlessness towards people he identifies as criminals.

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The big question in Watchmen - will you accept a lie that cost the lives of two million if it prevents a war that will cost the lives of billions? - is one a paladin might have a hard time grappling with. Ultimately I think they would have to decide that the villain's plan doesn't ensure that there will be no future war, but did kill millions of people, that the villain had no right to make world-changing decisions by himself, and that if a civilization needs a lie to prevent it from destroying itself then maybe humanity is better off without this particular civilization, even if it means nuclear war.