The issue at hand isn’t Buck’s innocence, but the means by which his death sentence was obtained. Prosecutors firmly established Buck’s guilt, but to secure a capital punishment conviction in Texas they needed to prove “future dangerousness”—that is, provide compelling evidence that Buck posed a serious threat to society if he were ever to walk free. They did so in part with the testimony of a psychologist, Dr. Walter Quijano, who testified that Buck’s race (he’s African-American) made him more likely to commit crimes in the future. (Quijano answered in the affirmative to the question of whether “the race factor, [being] black, increases the future dangerousness for various complicated reasons.”)
Racist bullshit.