"An altered past is as impossible to predict as the future."
This is difficult to explain, so I'll do that later. But in short, I believe that it's impossible for anyone to predict the future (more details on that later too), and from that, when saying, "I should have done that instead" or that kind of thing, you end up with a situation that even though you think it would have lead to the results you wanted, it might have caused something else unexpected to change (see also the law of unintended consequences) and you would have had different results.
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