“Wilson testified to his sergeant that he had not been aware of the robbery when he stopped Wilson; this was indeed publicly available information long before the grand jury’s decision. This testimony was completely changed during McCulloch’s press conference with no explanation.”
That change of story would have been very damning to Wilson had he gone to trial. His lawyers would probably have had to keep him off the witness stand so the trial jury would not have been able to hear Wilson’s own account.
The facts are nowhere near as clear as people think.