"...she had traded the anger of what should have been..."
In Laila Lalami's Secret Son, the teenaged protagonist Youssef has just discovered that his father, whom his mother has always said had died during Youssef's infancy, is alive, well and wealthy, unlike Youssef and his mother, who live in poverty in a Casablanca slum:
Always, and especially on days like this, he thought of what could have been. If he had grown up in a normal family, with a father, would he and his mother be struggling so much? The question usually made him feel melancholy, but now that he knew his father had been alive all along, he felt angry and bitter instead. Why should he and his mother be struggling so much? Perhaps that was why his mother had lied to him all these years: she had traded the anger of what should have been and given him instead the sadness of what could have been.
I like that dichotomy between anger/should and sadness/could. I had never quite thought about it that way.