Time travel in fiction is an excellent analogy for Hayek’s knowledge problem. You can’t go back because it is incredibly difficult to take into consideration all possible secondary effects. In fiction we have Barry Allan saving his mother, John Connor stopping Skynet, or stepping on a butterfly in the Jurassic era in a multitude of animated comedies (and The Time Machine.) People try to change the past, but are never able to change one specific thing, they create unintended effects.