Mens rea is the guilty mind required for something to be a crime. Intent matters as much as outcome or chance of outcome in the judgement of whether a crime has occurred, and explains the use of "sought" in the comment you replied to.
The story was just uncomfortable for me, so I felt relief when contradictory testimony was found. I live near Chicago in an area both white and black, and mainly left-wing. I didn’t dare bring the story up with my black neighbors, and never heard about it from them either, despite its high profile. It was a very self-conscious couple of weeks. In contrast, when Obama was running for office people couldn’t help talking about that, and the sense of pride was real.
There was really no benefit to expressing doubt either; actual tragedies and abuses (Laquan McDonald murdered by the CPD, for instance) are still fresh in everyone’s mind. If current events weren’t as horrific people might be more comfortable expressing doubt and maybe even laughter over a guy with basically a homemade lanyard around his neck.
Another thing to keep in mind: “igniting racial tensions” as an investigatory justification was how MLK got labeled the gravest domestic security threat to the United States. You’re advocating a categorical justification with a fraught and bloody history.
Better civilian oversight is overdue.