Playing With / Hitler's Time-Travel Exemption Act

Basic Trope: You can't go back in time, kill Adolf Hitler, and get away with it.
  • Straight: Killing Hitler causes World War II to be longer and bloodier.
  • Exaggerated: Killing Hitler causes a horrific Time Crash that shatters the Universe into innumerable little pieces.
  • Downplayed: Killing Hitler makes the war three days longer and causes the moon landing to be delayed by a year.
  • Justified: In absence of Hitler, a more competent dictator emerged to give Allies even bigger trouble.
  • Inverted:
    • A group of time-travelling neo-Nazis kills Winston Churchill, but that act just spurs the Allies into attacking sooner.
    • A group of time-travelling neo-Nazis talks Hitler out of suicide, but this causes World War II to end faster.
    • Hitler himself time-travels to the past in a desperate attempt to change his fate, he ends up become the catalyst of his inevitable suicide.
  • Subverted:
    • Bob announces his intent to stop the holocaust before heading back in time. Time Police expect him to kill Hitler and prepare to stop him. They watch over Hitler during the time frame Bob traveled to and he never showed up, much less tried to assassinate him. Turns out Bob infiltrated the Treaty of Versailles instead and prevented the reparations which would have led to Nazis rising to power.
    • You go back in time and kill Hitler... in such a way that it's mistaken for a suicide.
  • Double Subverted: However, that allows Josef Stalin's power to run unchecked, and he invades the now-peaceful Europe with no less brutality than Hitler would.
  • Parodied:
  • Zig Zagged:
  • Averted: Killing Hitler manages to successfully prevent World War II, thus, becoming nonexistent.
  • Enforced: The author can't imagine the world where World War 2 hasn't happened.
  • Lampshaded: "I wish I had a time machine." "And what would you do with it, go back and kill Adolf Hitler?" "Please... everyone knows that would only make things worse."
  • Invoked: The Time Police monitor Hitler and prevent time-travellers from killing him so that history runs its natural course.
  • Exploited: ???
  • Defied: After killing Hitler, the time-travellers stay in the past to ensure that history runs a new course that they plotted.
  • Discussed: 'Yes, I have a time machine. No, we're not killing Hitler. It never works, OK.'
  • Conversed: "I wonder why is it that killing Hitler always ends bad for time travelers on TV." "Perhaps because World War II was so influential in the history of 20th century? You can't just remove that and call it a day."
  • Deconstructed: To make sure nobody breaks the course of modern history, a Time Police is focused on protecting Hitler against time travellers. Since this work makes the Time Police complicit of Nazi Germany's crimes (and its agents are very aware of it), the agents affected to Hitler's protection live in a constant "My God, What Have I Done?" state of mind, and are very prone to suffer from alcoholism or nervous breakdowns.
  • Played For Laughs: After killing Hitler, the hero returns to our times and sees that World War 2 still happened, so he goes back in time to kill the new Nazi leader... which fails to change anything, so he does it again, and again, and again, untill finally getting sick of it and stopping himself from killing Hitler in the first place.
  • Played For Drama: A Holocaust survivor goes back in time to kill Hitler and thus save his family and friends among countless others - but it only makes matters worse, making the Axis win WW2.

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