It's a MOVIE! FICTION, EXAGERATION, DRAMA!
But, then again, people who believe Al Gore REALLY won Florida, Monica was a "vast right wing conspiracy", and that Clinton was a great president, will believe anything you put in front of them.... as long as it fits in with their own view of the world and what they believe is truth.
I plan to watch and enjoy the movie myself, but then again, I know it's just that, a movie, entertainment, fiction. I've loved Sci-Fi all my life, but I'm not stupid enough to believe it's ALL possible.