What major theme does "Just Mercy" highlight regarding the death penalty?

The correct answer emphasizes the theme of wrongful convictions as a critical issue surrounding the death penalty in "Just Mercy." Bryan Stevenson illustrates how the criminal justice system can fail individuals, particularly those from marginalized communities, leading to mistakes that result in innocent people facing the ultimate punishment. The book details various cases where individuals were wrongfully convicted and sentenced to death, highlighting systemic issues such as inadequate legal representation, racial bias, and poverty that contribute to these injustices. This theme underscores the notion that the death penalty is not only a severe punishment but also a risk that can lead to irreversible consequences for innocent lives. Stevenson's work advocates for reform and reflects a deep concern for the humanity of those caught in the penal system, making the exploration of wrongful convictions a cornerstone of the narrative.