Many remember Charlie Chaplin for his silent movies but there's a speech of his that is foremost in my mind. It's from The Great Dictator, the Hitler pistake comedy made around the start of World War II to encourage the US to join the fight against fascism -- muchlike Casablanca did in 1942.
I was thinking about this speech earlier in the year when I was working on the soundtrack mixed for Metropolis. These two films seem like bookends with Nazi Germany in the middle.
Both films say that compassion is needed to stop people becoming like machines. It seems to pre-empt the 'Nuremberg defence' and remains a powerful plea for humanity.