“The crime was committed at a time when the leadership of the State would not punish such assaults against unpopular persons or groups or their property and in this sense favored and even urged such assault. In addition, many of the highest officials of the State competed with one another, in the interest of their own political popularity, in the most violent denunciations of such persons or groups, thus arousing the passions of ordinary citizens who look to their public officials for counsel and direction.
