Each to their own, but she was under no obligation to vote guilty. I'm not sure why the article purports that "two white men" (I'm not white) were the "problem" here, and not that the problem was her inability to stand by her convictions.
I often disagree with what I consider dramatised recounts of history, as if it's always some good vs bad, David vs Goliath tale.
This was the 1970's in America, if she knew something that others didn't she should have had held her ground. As most people would have given that you are holding someones life in your hands. You can blame external factors all you want, but it is your still your reckoning.
And great, that this person eventually helped them rectify this injustice.
But what a silly way to tell the story.