Question: back to the future confusion? in the 2nd movie of the bttf trilogy, marty and doc try to stop martys son from committing a crime, but how can they change it from happening, if its in the future not the present

Answer: Doc went further into the future to see Marty's son commit a crime, then went back a few days (with Marty) before the crime happened. You see, if the crime didn't happen yet, it can be changed. I don't know if that answered your question or not. Basically, as long as the event hasn't physically and chronologically happened yet, it can be changed.
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