Start from here .. you don't speak for most. Not by any stretch of the imagination. The Till case is iconic, forever emblazoned for all time in history as exactly what it was, the racist murder of a boy by a thuggish mob in the racist American south. Murdered because he supposedly dared to whistle at a white women .. when in fact, Emmitt Till had asthma.
Point being, irrespective of how you view Till or his murder, history has already written that story .. and it's already written the story of how his murder became the impetus for the greatest social change in American history.
AS for the Martin case .. it just keeps making the point.