Wouldn’t say that the movie propagated that communism is bad. In my opinion it displayed how rotten and scared people were in that time. Most were not able to differentiate between a socialist, a communist, a political activist who had interests other than the U.S. . The movie stated something against exploitative government’s as far as I remember when Oppenheimer talked to Einstein. I say it is a very good representation of the times back then what you will take from that is yours.