Respuesta :
Unlike most animals, they're enjoyable. They don't do anything but sing til they die. They're calm, peaceful, and beautiful. Mockingbirds are nothing but amazing. It's a sin to kill a mockingbird just like it's a sin to kill a unicorn. To kill something so pure and harmless is horrible. That's why it's a sin to kill a mocking bird.
The mockingbird symbolizes life that should be preserved for the nonmaterial value it provides people through its singing is your answer.