Why is there nothing in the movie about Parker's politics?

I enjoyed this film for what it was, but I think it is unfortunate that they left out Dorothy Parker's political activism. The filmakers have the right to concentrate on only part of her life, and they probably decided that her politics would not be entertaining to the typical movie audience that can't deal with complexity in characters, especially in women, but it's a crime that they reduced the legacy of a brilliant and talented woman to her failed love life and suicidal disillusionment. We see her only as a cynical drunk and a libertine, which was very amusing and showed she was independent and liberated, but there was much more to her than that. There was only a brief mention of her participation in the Spanish civil war in the interview at the very end and a hint about her involvement with the Hollywood blacklist when the actor bought her a drink, also at the end, but that's all. There is nothing else in the film that even hints that in the 1930s Parker became an outspoken advocate of civil rights and civil liberties except for a few words on the screen at the very end explaining that she left her estate to Martin Luther King Jr. She helped to found popular Hollywood anti-Nazi and anti-fascist organizations well before WW2 began and was branded as a Communist because of it as were many other patriotic Americans, but nothing is said of that. Most of the jokers of the round table became so sick of her politics that they abandoned her, even after the war proved her right. It's no wonder she badmouthed them later on as loudmouths and mediocre writers.