If time travel were to occur it would create multiple timelines so these stories are not that unrealistic.
If I went back in time and killed me as a kid the present that I came from would remain unchanged. However I would create a new future where I had died. If I returned to the future I would either go to the one I came from, where nothing was different, or I would go to the one where I had died in the past but I could live on as the version of me from timeline A and never return to the original timeline. Time travel is only possible if it creates multiple realities.
Is it normal to hate time-travel fiction paradoxes?
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If time travel were to occur it would create multiple timelines so these stories are not that unrealistic.
If I went back in time and killed me as a kid the present that I came from would remain unchanged. However I would create a new future where I had died. If I returned to the future I would either go to the one I came from, where nothing was different, or I would go to the one where I had died in the past but I could live on as the version of me from timeline A and never return to the original timeline. Time travel is only possible if it creates multiple realities.