Wayne wrote:
"Exactly. Even if throngs of people in our future(s) are constantly changing the past on whatever scale you like, we will never ever see any evidence of it. Nor will we ever see it done. Because when it is done, the time line leading up to it being done is destroyed and so it never happens."

So how is that different from it never happening?

How do we distinguish the difference between what does not happen and what happens and can not be detected? Sounds like making a choice between 12 eggs or a dozen.

DA Morgan