Two recent homicides motivated a revenge killing in Dallas by Micah Johnson.To seek justice, the sniper, Micah Johnson applied the logic of social justice: (1) collective punishment, (2) all whites are guilty; (3) all white cops doubly so; (4) the scales of justice are balanced by killing cops in Texas whenever civilians are killed by cops in Minnesota or Louisiana.
The principles of America are to hold individuals responsible for their own actions in a political system that operates from Blackstone's formulation: it is better to let 10 guilty men go free than one innocent men be punished. There is no room for the presumption of innocence or individual justice in the mind of an SJW who asserts races or classes of people are guilty at birth.