In the Force, good and evil are facets of a single divine reality. They can no more exist apart from each other than the facets of a gem. Yes, some characters identify with the Light Side, others identify with the Dark, and Lucas expects us to cheer the former. Their gravity is farcical, for they aren't thinking that good is balanced and evil unbalanced, but that the two of them balance each other. What you say may all be true, but it goes right over the heads of those kids in the folding seats.
Nobody learns theology in a movie theater.
On the contrary, the movie theater is precisely where postmodern kids learn theology. Sure they're thinking about Good Guys and Bad Guys. Jake Lloyd, who plays young Anakin, offers various views of his character's later transformation into the evil Darth Vader. I have to become Darth Vader. He's a good guy.