Certified genius Stephen Hawking came up with a Chronology Protection Conjecture, which assumes that the Universe protects the timeline and will keep it intact no matter what time travellers try to do to it.
But why should the Universe be at all bothered by changes to the timeline? One past/present/future is as good as any other. What difference would it make to the Universe if any or all of them is/are changed once, twice or lots of times?
Does time travel unravel the very being of the Universe? No, it just alters it. And why should the Universe care if the inhabitants do the equivalent of knocking down the odd wall to create more space, repainting or removing stuff which has become unsightly or inconvenient?
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