Heres a hypothetical that I read somewhere else...

It is 1938, and Bush is in office. He feels Adolf Hitler is a threat to the world, so he takes action. He invades Germany under the guise of "Police action," and captures Hitler.

Did he just prevent the starting of World War II and the Holocaust?

You know where this is going:
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In doing the same thing in Iraq today, did Bush prevent World War III?