Many people have assumed, in the past, that Lucas is Conservative because the basic themes in his stories, starting with F-451 and through the entire StarWars series are strongly Conservative-themed.
The drivel he spouts in interviews are far less influential and meaningful than the themes that are expressed in the stories. Whether he realizes it or not, Lucas' movies are Conservative.
heck, I can name one reason why George Lucas himself could be considered a threat to civilization...Jar Jar Binks.