Releasing the information to the public does not preclude it being used as evidence in a trial (if it ever comes to that). But it does help us paint a more accurate picture of what happened. Had it been suppressed, we'd still think of Brown as an innocent who had no reason to attack the cop.
Public opinion is shaped by MANY things, not least of which is the actions of the police department in response to the protestors, and also the public's own experiences with police brutality.
And I do not see why information not favorable to the dead guy should be censored. It would have merely inflamed the rioters (let's be real, people throwing Molotov cocktails and shooting at police are not "protesters") even more if the erroneous boy-scout image of the deceased had remained unchallenged.
Why should his supporters have a monopoly on shaping public opinion?
Because public opinion isn't a judicial process and cannot acquit or convict the officer or the department.
That's not answering the question. Releasing information not favorable to Brown is not going to affect the possible trial any more than releasing information favorable to him. So why is it ok to release latter, but somehow not ok to release the former?
One reason only: you wanted pro-Brown misconceptions to remain and unfairly shape public perceptions. Shades of Rodney King (where his attacking the police prior to the beating has been ignored) and Trayvon Martin (multiple school suspensions, probable burglary, history of drug use and dealing - imagine if all these facts had been censored).
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A lawyer is a good idea at any point where you interact with the law, because they're the experts on how the law works.
And I still want to know who is paying for all of them, because the lawyers can coach the witnesses to bend what they saw in a particular direction. He who pays the piper calls the tune after all.