For the American Left, a bedrock myth is that white cops kill black kids. It derives from the overarching myth that casts racism as our indelible national sin. As Heather MacDonald explains, citing exhaustive criminology studies, it flows seamlessly from the quackery that dismisses the disproportionately high incidence of violent crime in African-American communities as an illusion — as the product of police racism and the consequent hyper-targeting of black boys and men, rather than of racial differences in patterns of offending.
Darren Wilson was a white cop and Michael Brown was a black teenager killed in a violent confrontation with Wilson. Therefore, Brown was the victim of a cold-blooded, racially motivated murder, Q.E.D. That is the myth, and it will be served — don’t bother us with the facts.
Another good point:
....Factually, the chatter about “conflicting testimony” falsely implies that all testimony is created equal. In reality, accounts given by anti-Wilson witnesses, where not patently fabricated, tended to be discredited by forensic evidence. The forensics, instead, corroborated the exculpatory testimony — much of which came from African-American witnesses, a fact that undermines the myth and therefore goes largely unnoticed. The grand-jury rules are more permissive than those that govern criminal trials, but prosecutors are still ethically barred from asking the grand jury to rely on testimony they believe is false, inaccurate, or unconvincing.
Emphasis mine. Blacks who are tired of the idiocy of other blacks get the worst treatment. Their voice is ignored whenever they cannot be intimidated.