Once it got started, and they’d believed the “eye-witness” who claimed Brown was shot in the back, no. Nothing “the system” could do would convince them otherwise (or so they would pretend for the sake of “the cause”).
If the initial media reports of police shootings had involved video from the officer’s body camera, instead of dubious witness testimony, this would never have become a cause celebre with the left and race-grievance industry. In fact, the only analogous incidents which would if there were always body camera video are the ones that we FReepers also decry as police over-reach and thuggery, and these would be fewer in number since cops would know they are on video.
If Ferguson produced a video of the attack that didn’t fit the narrative, they would just dismiss it as HIStory. And the MSM would not show the GG attacking Wilson.