Crazy Back to the Future Theory You Didn't Know!

Do you remember the Back to the Future? In the first movie, Marty McFly goes back in time with Doc Brown's deLorean car, but while doing so, libyan dudes muck Doc. Marty sees younger versions of his parents, his mother accidentally falls in love with him, and Marty must make sure that his parents fall in love with each other so that he will still exist in the future. And to go back his time, Marty finds Doc of this time to return to his own time and save Doc's life. With Doc Brown's help, he found a way to go back to his time. Before going back to the future, Marty gave Doc a letter to inform him about libyan dudes' attack. However, Doc was believing that messing with the timeline will have worse consequences, and tore the letter into pieces. But when Marty went back to his time, we saw Doc actually reunited the letter, read it, and wore a bulletproof vest.
Okay. That was the breaking point of the story. If Doc believed that knowing the future will have bad consequences, then why did he read the letter? What changed his mind? Let me explain. In the final chapter of the film, Marty's father George punches Biff, knocks him out, and takes Loreine to dance. As we saw from Marty's picture, this event saved the future lives of him and his siblings. After that, Marty gets to Doc, in order to get back to his own time. Here, he tells Doc about how George fought against Biff for the first time in his life. When Doc heard about that, this was his reaction (scene). He realized that changing the past can have a positive impact without any catastrophe. Plus when we consider he just learned about time travel, and didn't know any practical experiments on that subject. So after knowing this, he understood his theory wasn't completely correct. And this is the reason why Doc read Marty's letter after some time. And prepared for the future.
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