The Severe Lack of a Redo Button In Life

It is very, very easy in life today to want to compare the happenings with those things that are relatively new to human experience, and here I'm referring to computers. Windows and some other operating systems have a system restore option built in. Have a system boo-boo of large enough impact and simply run system restore; you can even pick how far back you want to take the system!
For me, there would be two points that I'd want to restore my life to; late fall 1977 and late summer 1979. Those were two very pivotal moments in my life, though there are many more. The thing is, what's to keep those things that would happen from happening? Life is a series of seemingly unrelated events that suddenly tie together in to what we know as experience. Everything shapes us, and we either become stronger for it, or weaker. I am not going to advocate some plan or meaning behind it all. It may simply be just because it is. Dreadful, I know.
Even if there was a way to undo some of the damage that may have been inflicted upon your life, is it even wise to do so? How many other things might be undone simply by your undoing? Reality is a web; you pull one line here, and the whole web senses a shift.
In a word, somethings were simply meant to be the way they are. Nothing, in the end, can truly be undone.