If Lucas thinks Star Wars was about Vietnam, he is woefully ignorant on the Vietnam War or the Nixon administration (and he was alive for it!). The North Vietnamese regime was no innocent rebellion fighting "evil U.S. imperialism": it was a satrapy of the Soviet Union, committing daily war crimes against "enemies of the proletariat." If Star War was about Vietnam, them the Galactic Empire is the Soviet Union, the rebels are various Balkan, Caucasian and Baltic states who didn't want to be part of the Hammer and Sickle, and the United States was the "Republic" supporting various rebel groups fighting their galactic adversary. At no point when watching Star Wars do I think "wow, that has something very wise to say about Vietnam!" Whereas there is a Trek episode that directly addresses the Vietnam War and actually takes a position supporting military action in SE Asia. Roddenbery is also talking about the OT (he was dead by the time of the PT) and the 2005 article mostly references the PT and all the silly "Bush is the Emperor" messages. Star Wars is apolitical (unless the year is 1940 and Nazism is still vogue), and when it gets political we usually are blessed with some of the worst entries of the series. Other media (such as Trek) does social commentary far better, and not many 10 year old kids seeing "Star Wars" for the first time care about the politics of Vietnam (contrast this to Trek, which has inspired the careers of many real astronauts and scientists).