That's simply because all those movies are filmed to make the resistance look absolutely good and perfect in every way, and the empire or whatever bad and evil in every way. The normies just side with whatever side the movie wants them to side.

There's also the "Real life is not a movie, it's more complicated!!" excuse.

Make a story where the villain is actually the good guy all along, most people won't get it and will blindly hate him because the movie told them he was the villain.