Very good! You and I think a LOT alike on this subject.
The answer for me is, that if I altered the future by removing a causality, all I would do is create the conditions for some other causality to occur.
For example, if I went back in time and killed Hitler, thus averting 50,000,000 people from dying in WWII, how would I know that there wasn't another far more demonic human being who would have ended up killing twice that number that would have come to power? How do I know, that there wasn't another nation besides Germany considering world conquest, like France, for example, who would have caused WWII to happen anyway?
By changing the course of events, there is the possibility you could have a whole series of unknown consequences occur, sort of like dominoes falling one after the next in a long string of consequences. Since you don't know what affect removing an important causality would do, you cannot predict what other factors would come into place that would be equally horrible if not worse.
Maybe if Hitler had died, the Germans would peacefully have figured out nuclear weaponry and then gone to war and caused a world holocaust of unbelievable magnitude when an unknown OTHER dictator finally came to power - who knows? Its all speculation.
Maybe, if Martin L. King had not died, he would not have had half the impact he has had on society. In fact, he was killed in a motel, where he was having an affair with another woman. Even though he died this way, doing something morally wrong like that, did not change the essential nature of all the good things he did - but making him a martyr made him immensely more powerful as a historical leader.
The answer is, I would not go back and change things because it could have had seriously repercussions for the future. Maybe YOU end up not being born i the alternate time line.
Yes, I have often speculated on parallel universes. I believed in the existence of parallel universes long before people like Stephen Hawking thought they exist...you don't have to be a cosmologist or a genious to figure out what is potentially possible. I considered the possibility of parallel universes over 45 years ago, long before any cosmologists were talking about it. I also thought about parallel computing long before Intel or any other company starting doing parallel computing. It just occurred to me many years ago that if you ganged a bunch of CPU's together in parallel, you could multiply the data output...I talked about it 30 years ago and people looked at me with a blank stare - they had not taken the possibilities to the next level in their minds yet. This has always been my problem, I have always been ahead of the game in my thinking process...I call it, Future Vision.
It is NOT like being a psychic...I am not predicting the future. I am just merely, looking at what is possible.