why does tom robinson escape from prison knowing that he will face an appeal?

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http://www.sparknotes.com/lit/mocking/

In Harper Lee's novel, "To Kill a Mockingbird," Tom Robinson is a black man who is falsely accused of raping a white woman, Mayella Ewell. Despite the lack of evidence and conflicting testimonies, Robinson is found guilty by an all-white jury, reflecting the racial prejudice prevalent in the community.

After his conviction, Tom Robinson is sent to prison while awaiting an appeal. However, he sees no hope in the justice system, as his race greatly diminishes his chances of receiving a fair trial. Tom knows that the odds are against him, and he believes that escaping prison is his best chance at avoiding further injustice.

Tom's decision to escape from prison is driven by a desperate need for freedom and a desire to protect himself from the racial discrimination and violence that he believes awaits him. It reveals the pervasive racism and injustice that existed in the town during that time period.