History: Learning From Mistakes
If you could go back to 1889 and strangle Adolf Hitler in his crib, would you do it? At one level, the answer is obvious. Of course, you should. If there had been no Hitler, presumably the Nazi Party would have lacked the charismatic leader it needed to rise to power. Presumably, there would have been no World War II, no Holocaust, no millions dead on the Eastern and Western fronts.
But, on the other hand, if there were no World War II, you wouldn’t have had the infusion of women into the work force. You wouldn’t have had the G.I. Bill and the rapid expansion of higher education. You wouldn’t have had the pacification of Europe, Pax-Americana, which led to decades of peace and prosperity, or the end of the British and other empires.
History is an infinitely complex web of causations. To erase mistakes from the past is to obliterate your world now. You can’t go back and know then what you know now. You can’t step in the same river twice.