Scout has learned well from Atticus the importance of empathy, of putting oneself in other people's shoes. And she applies this lesson to Tom Robinson and Mayella Ewell. She understands that both of them are victims, albeit in different ways. Tom's the victim of widespread racial prejudice, whereas Mayella, hailing from the notorious Ewell clan, is universally despised as "white trash."
Scout realizes that Mayella's in an especially vulnerable position due to her being completely alone. Tom has Atticus to defend him, but Mayella has no one. In convicting Tom of her rape and assault, the jury didn't so much believe Mayella as act on their ingrained prejudices. A black man was accused of raping a white woman, and as far as they were concerned, that's all they needed to know.
Even though Scout's still only a young girl, she instinctively understands that Tom's trial is nothing but a travesty of justice. Her childlike sense of right and wrong is offended by this miscarriage of justice against...
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