Some key messages in Forest gump -
Peace protesters are wife-beating hypocritical drug-taking communists who hate america.
US troops in vietnam were the good guys.
They even lifted the real-life story of Ron Kovic from Stones' Born on the forth of July but tweaked it so that rather than finding some meaning in life by confronting on the criminals in power, Lt Dan (the Kovic character) stops being all miserable and negative, finds god and comes back into the fold.
You could probably do an entire course in film propaganda based on the work of tom hanks.