Is it possible that the past is meant to be the way it happened.

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Right now I'm reading Stephen King's book 11/22/63. The basis of the book is that a man from 2011 finds a way to travel back in time and changes history by stopping the JFK assassination. When he goes back and tries to change past events he finds that it is very hard to do, there are so many "unexpected" events that happen as a way to try to prevent him from changing it. Things like flat tires, getting into fights, unexpected storms, etc. What he finds when he goes back to our current time, after succeeding at stopping JFK from being killed, is that the world is literally ripping itself apart. Earthquakes, atomic warfare, huge storms, and other events are killing off the people on the planet and destroying the planet. The guy goes back and comes home without changing anything and it's all back to "normal". Each time he goes through it "resets" the changes he made the last time he was in the past. This all seems to point to the belief that what has happened in the past was meant to be that way, how it needed to be in order to keep our future as it is. I know this is just the theory of one writer, a fiction writer at that, but what do you think? If you could go back and change the past, would you do it? Would you be willing to risk an uncertain future to come back to change the past?