I don't believe in this 'time will make sure you don't mess anything up' stuff. Is time an intelligent being? Does it know anything about humans and reproduction? For that matter, does it know anything about leaving a room, or about rooms at all?
I find it more likely that time will not allow a paradox by not making time-travel work at all.
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The strength of a civilization is not measured by its ability
to wage wars, but rather by its ability to prevent them. - Gene Roddenberry
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