I can't see how any of the Star Wars movies indorses free will, they're all about destiny and fulfulling one's destiny.
Lucas said you have to choose to follow your so-called "destiny". Thus, if one never makes this choice, it is never fulfilled. The movies emphasize the importance of choice. Also, destiny is in the eye of the beholder. In the case of Luke, the moviegoer's idea of Luke's destiny is quite different from the concept of Luke's destiny as held by the Sith.
The Star Wars films are not an exercise in predestination. It's just that many viewers are hung up on predestination and tend to project it into what they see. Just because things turned out a certain way - as dictated by the traditional convention of happy endings - does not mean that it was the only possible way they could have turned out in-universe.
In the commentary for A New Hope, Lucas said that Luke could always have run away, but once he made his choice do think that Luke had one direction to go in. And in any event in the Star Wars universe a person's fate is decided on by the Force.