In some cases, cameras would help. In others, probably not.
If Wilson had been wearing a camera, it would prove that he was acting in self defense and make a grand jury’s call simpler, but it still wouldn’t stop the claims that he could have acted differently.
Brown’s cousin was on TV the other night claiming that Wilson should have calmly talked to Brown and tried to reason with him. He cited a case where this was done and all ended up well. Cameras won’t deter the Monday morning QB’s claiming that the police should have done this or that to diffuse the situation.
Another thing - cameras would set the narrative from day one, preventing months of a false narrative from taking hold, e.g. Brown was holding his arms up in surrender when he was shot.
It's hard to reason with two thugs walking down the middle of the street who, when asked politely to move to the sidewalk, tell the cop to go f himself and then proceed to beat him up and try to take his gun.
EVERY TALKING POINT by these thug enablers fails to hold up to the evidence as we have it. More evidence in the form of a camera would not change a thing, IMO. We saw it with Trayvon as well - any fact that conflicts with the meme (basically, just about all of facts fit that criteria) is ignored, downplayed or shouted down.