The answer could be that the author wanted to show readers how unjust, cruel, and incorrect prejudices can be. After the main conflict is resolved, the narrator goes on to prove how incorrect everyone's prejudices about the Duvitches were.
I read that book last year :)
I think that 2, If I were the president, I would create more jobs, and 3, If Diane had been a cat, she would have climbed the tallest trees are <span>written in the subjunctive mood. </span>
