Twitter users pointed out that Hughes was in fact marching at the time one of the shootings occurred. Later, a video surfaced of him being taken aside by police and handing over his weapon to officers.

Hughes turned himself in and was later released from custody, Dallas News reports.

Amid such tragic footage, the question that remains is whether this wider dissemination will change hearts and minds. “Technology does not eradicate racism, and it does not exact justice,” writes Marcie Bianco. “Assuming otherwise will only make the problem worse.”

Yet, as a vehicle for shining light on horrors that would otherwise go unnoticed it is having a powerful role.

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