Collective brainwashing.I was just thinking about this. If our decisions cause us to change timelines, wouldn't we see changes ALL the time? What if we accidentally make a huge leap, and the change is so big that you're labeled crazy for being concerned. Example: You manage to switch to a timeline where the Nazi's won and we're all speaking German. What is stopping that from happening?
Changing your reality is one thing, changing the shared reality is far more difficult.