The world actually doesn’t need more people who agree with each other. It needs more people who can disagree with others with skill, integrity, clean boundaries and without condemning the other person, punishing them or needing to dominate them.
You cannot do someone else’s emotional work for them. Take responsibility for your part in the story, however complicated it may be, and allow others to carry their own. And for the sake of your own peace of mind, know when to step away.
People hold on to anger because it helps them cope with pain. Seeing the world in black & white, victims & villains creates a story that is simple, morally clear & easier to live with. Simple stories are emotionally satisfying, even when reality is far more nuanced and complex.