Why does William Ury say peace is impossible?

William Ury argues that peace is often perceived as impossible due to deep-seated emotions, historical grievances, and entrenched positions that fuel conflict. He emphasizes that parties in conflict typically focus on their differences rather than their shared interests, leading to a cycle of hostility. Ury advocates for understanding and dialogue, suggesting that by addressing underlying needs and fostering empathy, it is possible to move towards resolution and peace, despite initial perceptions of impossibility.