Your brain lies to you every second you open your eyes. It falsely creates the impression that you don't have a blind spot in each eye, but in fact, you do. Similarly, your brain fools you into thinking that you have free will. Studies have shown that people often do something, and then later decide that they consciously wanted to do something. In fact, they performed the action before they actually decided to do it. Free will is an illusion, although as a corollary, it should be pointed out that you'd behave the same way if you somehow managed to violate the laws of physics and have free will
Personally, I believe that time travel and the 'many-worlds' theory are both not only possible, but also mutual. By the many-worlds theory, a time traveller who makes changes to the time-stream would simply find the universe split into another reality where those changes happened, and the original universe the time traveller came from would not be changed at all. The time traveller him/herself would simply be unable to ever make it back to their own universe. The most simple way of looking at it, that I've ever found to be bizarrely accurate to my own beliefs that is, is the 'Trousers of Time' theory as described in the Discworld novels. To be fair, I did already believe this theory before reading Discworld, but those books put it into a context that is much easier to understand.
Humans are inherently evil. The evidence for this is in the acts people do, that people are basically capable of doing. I refer you to this for more evidence as such:
A human is not made 'good' by doing good deeds. A 'good' human is simply one who manages to avoid committing evil acts. We make ourselves feel better by doing simple acts like giving money to the homeless man on the corner, making ourselves believe just for an instant that we have done some good in the world. But that homeless person will be able to eat a sandwich with that pound you give them, but they'll still be on that street corner the next morning, watching you ignore them again as you walk to work, earning money to feed yourself decent food every evening. We are all hypocrites by our very nature, and true enlightenment is purely the realisation of that one basic fact.
Your brain lies to you every second you open your eyes. It falsely creates the impression that you don't have a blind spot in each eye, but in fact, you do. Similarly, your brain fools you into thinking that you have free will. Studies have shown that people often do something, and then later decide that they consciously wanted to do something. In fact, they performed the action before they actually decided to do it. Free will is an illusion, although as a corollary, it should be pointed out that you'd behave the same way if you somehow managed to violate the laws of physics and have free will
Why would someone have stopped Hitler coming into power? How do you KNOW this as fact? Could there not be unbreakable rules that prevent such actions? Could time not be changing constantly due to time travelers, and we, with our limited senses simply cannot see it? What if everyone in the future simply sees World War II as a necessary event? What if they all just like Hitler?
One cannot make claims like yours - we simply do not know.
The key word in my second argument is "if" The point I meant to make is that even if nothing else prevented a time traveler from going back in time to kill Hitler, it would still result in a contradiction, which renders the concept invalid, and the same logic holds true for all deliberate attempts to change the past. Yes we are dealing with unknowns, but we can still theorize. Philosophers do it for a living. And when it comes to things like hypothetical future technologies, theorizing is the best we can do.
To those who have discussed the assassination of Hitler (thereby validating Godwin's law):
Your views on time travel are not the only ones out there. If you examine your own views on time travel, you'll find they're intrinsically linked to your views on fate.
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