Because he wasn't there. He went back in time and influenced events. When he came back, he didn't exist in the past.
Einstein covered this in his 1926 essay 'Time, relativity and I haven't a fecking clue.'
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Because he wasn't there. He went back in time and influenced events. When he came back, he didn't exist in the past.
Einstein covered this in his 1926 essay 'Time, relativity and I haven't a fecking clue.'