Even if it COULD happen, which Einstein was pretty sure it couldn't but lets assume for the sake of argument that it could, then by going back in time you would end up in a parallel time line (based on the current theories of time and space). So, if someone were to go back in time and alter something then it would only affect that particular time line. It wouldn't affect the time line the person originally started from. Someone could travel back in time, kill Saddam when he was an infant, and save that world a whole lot of trouble. We would still have to execute him though.
I say it's fiction, and I think we should all be glad it is.
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When one person suffers from a delusion it is called insanity. When many people suffer from a delusion it is called religion.
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