Or could have been really good, but were politically unacceptable to Hollywood's liberal stance. Just think of the major events in our history that have never been addressed by Hollywood. The story of America winning the cold war. The story of Stalin's purges. The story of the fall of the Berlin Wall - juxtaposing the totalitarian control of Communism with the freedom of the West. The story of John Paul II and his role in returning freedom to Eastern Europe. The post-Korean war years and the build up of North Korea's nuclear program under our noses. Etc.
You have funny ideas...(just kidding.)