I don’t believe in going back and changing history, it is easy to redefine one event for a different outcome but there is little heed paid to the ripples of your new reality.
When you toss a coin and call heads or tails the impact of your choice does have some effect on the next time you flick it in the air. Did you get it right, then maybe you will be more likely to go with the same decision again (or maybe not because it’s 50/50) so changing your mind is going to have repercussions.
Let’s say you have you do a coin toss once a day, then you are creating 730 different realities a year. If everyone on the planet did the same then we are creating 5,110,000,000,000 options a year. This is just human decisions over a coin toss, it doesn’t count the myriad of choices we make every day let alone over a lifetime.
Now consider the impact of making a big change to your history. This is not just a Butterfly in Tokyo causing a tornado in Texas, it is creating a hurricane in your life.