That can only happen on terms acceptable to a conservative institution, such as corporate-owned media, if white men with guns are allowed to continue shooting black youths in hoodies with impunity.
Armed vigilantes, such as Zimmerman, are characters in an eternal morality play that is supposed to teach us lowly consumers of TV news how to maintain our proper place in society - that includes obedience to men with guns. Note the central role of ABC in releasing exculpatory evidence. A conviction would undermine that narrative, and might deter future spontaneous violence against lower-class Black youths. Programmed acts of social violence not only "sells newspapers", it keeps money and power in the hands of the One Percent, and many reporters seem to relish working these racially-tinged crime stories to death. Look at the OJ Simpson spectacle.
As for race/class, and the role of individuals that's become more complex, and more difficult to handle in recent decades. There is still racial avarice at work in this narrative ("F-cking coons), but it is no longer acceptable to attack an adult black man wearing a suit or in uniform, as it was in the '50s in many parts of the US. There's a reason that Obama is rarely seen in public without his trademark power suit. That signifies his elevated status as a non-target, which maintains the existing power structure, despite his race.
I know that's very dry and academic, but it's also the answer that fits your question.
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