Oh, God, this would be such an incredibly destructive precedent to set. Blacks, or more accurately the lawyers hired by blacks, would be tempted to use this defense for every crime ever committed. Racists would point to it, with some justification, as the most egregious example of entitlement ever presented and would use it to propagate even more hatred and discrimination, thus escalating the spiral.
/shudder
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In a time of universal deceit, telling the truth is a revolutionary act.