Possible essay topic

I think an interesting topic to write about in Watchmen would be Dr.Manhattan's impact on the outcome of the story. Manhattan is extremely powerful, knows the future, and is arguably a god. Because of this, I believe he could've prevented Veidt's actions and the death of millions of innocent people. The question would be, Is Dr.Manhattan to blame for these deaths and could he have stepped in? Also, should it have been his responsibility to save the day?