In many books and movies dealing with time travel, there is the implicit (and occasionally explicit) 'rule' that the traveler never changes anything, because it may 'alter the course of history.'
Think Back to the Future, Hot Tub Time Machine, The Terminator, Harry Potter and the Prisoner of Azkaban and 12 Monkeys, just to name a few.
This 'rule' likely plays a role in Henry avoiding himself in the past, because he wants to be sure his future with Claire and the birth of their daughter all happen as he knows them to.
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