If a person "sabotages their goals" as stated, then, their goal was actually to fail, and they still got what they desired. That isn't sabotage, that is purpose.
If, as you say, it may be unknowable, that is the point I was making. They didn't know, so did the best they could with what they did know.
Such examples in no way invalidate what I wrote.
I agree completely with the rest of what you wrote. We certainly can and do learn from other's mistakes.
Nobody
intentionally makes a mistake, else, it couldn't be a mistake if it were intentional, could it?
Understanding this has helped me tremendously in my own choices regarding what to do with my chairs, as well as groking what others do with theirs.