Different decisions can change so many things about the future. How do you know what the right decision is? How do you know what you are doing is for the better? What if something so drastic happened that your whole life changed in an instant. You have less than five seconds to act, and you have no time to think about what you need to do. How are you supposed to make the right decision based on so little time? Even after it's happened, it's impossible to know what would have happened if you made a different one.
No matter what happens, you live with the consequences of your actions.