re: The Watchmen

I think the point of using Dr Manhattan for the ending was to show him telling humans to knock it off or else. He was basically sending a warning. Even Ozymandias didn't know he was invincible until right before the end. There was a great quote after Ozymandias tried to kill Manhattan

quote:

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I've walked across the surface of the sun. I've seen events so tiny and so fast they hardly can be said to have occurred at all. But you... you're just a man. And the world's smartest man poses no more threat to me than does its smartest termite.

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Right there it was settled, even for the smartest man in the world, that Manhattan was invincible.