Seeing an innocent member of your 'team' die tragically feeds this sense of 'us and them.' Micah Johnson, the Dallas shooter, did not see fathers, sons or brothers. He only saw white people and cops. This is the same mentality that fuels the atrocities of ISIS. When we see a group instead of an individual we feel justified in killing an innocent member of that group. Trained as a soldier, Johnson only saw 'the enemy.'