That's the crux of the game. The entire structure is purposeful. It's made the way it is made to elicit feelings of anger when you play as Abby. You are supposed to not want to engage with her story. Just as in real life, when someone does something or says something or believes something that you despise, we don't engage with them. We dismiss them.
However, it is only thru engagement that we actually start to develop a better idea of their motivations, why they believe what they believe, and what has happened to them that has created this kind of behaviour. It humanized them.
This entire game is calling for us all to put aside our initial reactions to people we disagree with, people we have extreme negative emotions toward, and look at them as complex humans who are motivated to operate in the way they do because of an entire life or moments of pain and joy that sculpt them into the person you're interacting with now.
There is a strong parallel between Abby as your own personal "outgroup," and all the game is doing is asking you to engage with her story to see what happens for you. If you can start to see her on a different way
So would you say this is a more central/important theme than revenge is bad?
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It's like paying for bubble wrap. -transience on Final Fantasy: All the Bravest