There is a story of a Tibetan monk who wept when he remembered how the Chinese had tortured him in prison. His listeners, of course, assumed that the reason for his tears was the memory of his personal trauma. However, he wasn't crying for himself; he was crying for the Chinese who, as a result of their cruelty, would reap such intense suffering in the future.
If we could maintain this long-range perspective, it wouldn't be so difficult to wish for our oppressors to stop creating their own pain. This approach takes some cultivating; but if we work with it, we will sow seeds of happiness for all concerned.
— Pema Chodron, No Time to Lose