So since we never got a full series due to the author of the full metal jacket author dying, is it okay that we as viewers can interpret our own ending for joker once he gets back home after the movie?

For me it has to be Schindler's list. The movie was well acted, well paced, and it just decided to say "fuck your feelings" and decided to portray the Holocaust at it's worst. And the idea Oscar Schindler unknowingly saving his workers when he only wanted to keep his factory in operation, was great writing. The scene where some of the Jews are gassed in the showers is still haunting.