Thank you all 3!
This is my review/criticism of 22-11-63 which i'm gonna park here until i can make my own thread about it. It was a shock to me to see such a plot hole in a King novel, so there. To date, the long walk is the best thing ever written by him, to me, it's deceptively simple structured, realistically dystopian, with a not-open end/open end.
The GIGANTIC PLOTHOLE IN 22-11-63 by KIng:
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The big big plothole is of course the reset button. To know for sure if Oswald was the killer, he could have killed Oswald in 1958, go back to 2011 to see if Kennedy survived or not. If he had not surivived, Oswald would not have been the killer, and he would have had to go back to 1958 which would have reset Oswald into life again, might even have prevented him from becoming a patsy, saved Oswalds life. And then he would have had to wait for the real killers to show up. Preventing the attack would have been easy with a modern fake IED, (to spook the Secret Service) that would explode BEFORE Dealy Plaza, at a point where the motor cade could still turn.
But sure, then we wouldn't have a 800 page novel, so I guess that's motivation to ignore the plothole right there.
This doesn't get mentioned a lot by reviewers, only some boards discuss this like the Guardian and Reddit.